A wonderful collection of pictures of dogs
Taken from the AKC website.

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More in a week’s time.
Dogs are animals of integrity. We have much to learn from them.
Author: Paul Handover
A wonderful collection of pictures of dogs
Taken from the AKC website.

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More in a week’s time.
A YouTube from 2002.
It’s just six-and-a-half minutes long. Please watch it!
Then ponder on how these dogs were trained up to such a high standard!
Here’s the introduction to the video.
Hooked On Swing
World renowned dog trainer Mary Ray performs her “Hooked on Swing” routine at Crufts in 2002 with a couple of dancing dogs, Quincy and Kizzy as her dance partners. Since some of the tunes are Glenn Miller songs Mary is dressed in an authentic uniform from the World War Two era. A great performance that both Dance Fans and Dog Lovers should find entertaining.
Incredible!
Another republication of the Spanish walk by Tom and Chica.
There was such a wonderful response to the post on the 28th January that I decided to republish another one. This time I have started at the beginning.
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If you tell someone you’re planning a long walk in Spain, they will mostly assume you’re talking about the Camino de Santiago pilgrim trail across northern Spain. Tom being a bit of a misanthrope said he’d rather go somewhere less crowded.
We are familiar with a part of the GR7 as it runs through the Serrania de Ronda where we have spent a few recent winters. After more research it was decided that this would be the most interesting.
The GR7 starts on the south coast at Tarifa, near Gibraltar, and then runs up through the Los Alcornocales, a beautiful forest of cork oaks, then into the Grazalema National Park before reaching the city of Ronda. Dramatically perched above a deep gorge, Ronda is our favourite city.
From there the route turns eastwards towards Antequera and passes through the Parque Natural del Torcal whose bizarre rocky outcrops form one of the most impressive karst landscapes in Europe.
Shortly beyond, the route splits and Tom and Chica will be taking the southern variation through many small villages into Las Alpajarras. Then it heads up into the Sierra Nevada and there it may get tricky depending on the snow level. Chica isn’t keen on being belly deep in snow!
As the route heads north inland from the east coast, it is all new territory for us. There should be a couple of visits to both our charities near Alicante and Valencia and then due north to the border with Andorra. The final stop for recuperation will be with good friend, Kate, in the Pyrenees.

At last, after a fair few hitches and glitches, Tom and Chica took their first steps on a journey that will take them right across Spain to Andorra on the GR7 route. The start is at the aptly (and purely coincidentally) named Playa Chica, which is the most southerly point of mainland Europe. From here, you have the Med to the east, the Atlantic to the west and Africa on the horizon. It’s an epic trip and one that only around five people complete every year. It should cover a variety of landscapes, starting today with the beautiful beaches of Tarifa and the surrounding area. As it’s a Saturday, with a good strong breeze, the kite surfers were out in force. It’s quite a sight!

Today was a short toddle, by comparison with what will follow – just 11k in about 2.5 hours. The route was almost entirely on the beach and Tom shed his shoes and walked barefoot. It might be the only time that will be possible.
Given that he is recovering from flu an easy start seemed a good plan – definitely so as it’s now raining! Chica, however, needs to understand that stopping to investigate every interesting smell would mean the walk would take several years.
We will be posting a blog every day of the walk, with information on the route, the scenery and the flora and fauna. Tom isn’t able to carry field guides – too much extra weight – so identification from any of our followers would be appreciated, starting with these shells found on the beach today. These pics will be posted on our instagram page too.

As well as posting our position, hopefully using Viewranger (we’re working on this) we will also give our position using What Three Words. Tonight’s are: tigress, asked, varies. This is fun and will be another way of ensuring that the back up team (me) can hook up with them.
Stay with us!

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This is an incredible journey and I’m so pleased that Tom is happy for me to share it with you.
And, please, do follow Tom and Chica directly.
From someone who knows!
From time to time I have an offer of a guest post. That is a person who wishes to write for Learning from Dogs. In nearly all cases I say ‘yes please’.
So it was with Adrian.
On the 15th January this year Adrian emailed me:
Hi Paul,
My name is Adrian and I am reaching out on behalf of Scott’s Police K9. I’ve followed your Learning from Dogs blog for a while now!
We write content for the family protection dog industry and love to share our expertise.
I’ll keep it short, I think I could be a valuable contributor and I would love to provide additional content to your site!
Please let me know if you are interested, I will send you a couple suggestions to choose from, which I feel would resonate with your readers’ interests. We’re also open to topic suggestions that you might want to touch upon on.
Thanks for your time and we hope to hear back from you soon.
Adrian Brito
On Behalf of Scott’s Police K9
https://scottsk9.com/
I replied to say that I would love a guest post, and here it is!
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By Steve Scott
If you’re the new parent of a protection dog, congratulations! You just made one of the best purchases for you and your family’s well being. Personal protection dogs are loyal animals that will happily become one of the “pack” and put all of its training, skills, and intelligence to work in looking after your family.

Should you be on the verge of bringing home your new family member, you’ll likely be wondering how to help them adjust to life at their new home. Read on for the best tips and tricks for a smooth adjustment for your trained K9 companion.
Visits with the Family
Dogs, even intelligent ones, prefer to be familiar with their surroundings, people, and environment. When your protection dog is being raised and trained, it will be beneficial to visit and begin bonding with the dog.
Bring each member of your family, and any important people your protection dog will be in charge of protecting once you take them home. If you have another dog and the trainer or foster allows it, provide some time for your protection dog to play with your current family pet.
Getting to know your protection dog before the big day when you take them home will help them, and you adjust to the new living arrangement. They will begin to associate you with someone they enjoy being around and when it comes time for you to train with the dog and the trainer, you’ll be a step ahead.
During this time, the dog shouldn’t leave the trainer or foster parent to spend time with you. Instead, you should visit the dog in the environment and surrounding it knows best with the trainer present.
Time of Day
When the big day comes, and it’s time to bring your personal protection dog home, plan to do so early in the day. Great protection dogs are raised to protect you and they’ll want to get a good look at their surroundings.
Moving a dog at night will cause a greater sense of unease and anxiety.
Introduce them to unfamiliar territory when there is plenty of daylight and the opportunity to explore together. Show them your house, the surrounding, and if you live in a place with property, walk the land with your new pup.
This will help them get oriented with the place they have sworn to protect and settle them in right away.
Be Ready for Their Arrival
When you bring your personal protection dog home, be ready for their arrival. Have their food bowl ready and filled. Ensure they have fresh water and a comfortable place to sleep. Acquaint them with their belongings, toys, dog bed, and everything related to their personal ownership.
Be prepared to spend most of the day with your dog, getting him used to your house, property, and your family. It’s important that you don’t bring your dog home then leave shortly after.
Adjusting your dog to your home and family takes time and is a crucial part of the bonding process.
Establish a Routine
All dogs thrive on routine. Help your new protection dog get to know yours. It’s a good idea to bring your protection dog home when life is normal, and you’re not planning on going on vacation in the following week.

Give them time to adjust to your routine. Protection dogs like knowing what to expect, what type of work they’ll regularly do, and the way your “pack” functions so they can better serve you.
Will you take them with you to work? Start taking them right away and put routines in place, so your protection dog knows this will happen regularly.
Will you leave them with your spouse and child at home? Have a ritual of letting them know you’re leaving and make sure they know that their job is to take care of your loved ones.
Plan regular times of continued training, running and playing daily after work and on the weekends. This will help them smoothly fit into the regular ebb and flow of your family’s work, school, and routine schedules. Also, protection dogs love to remain active.
Supervision Required
As you show your new protection dog around the house, yard, property, and introduce them to friends and family members they haven’t met, keep in mind that supervision is required.
They will still be getting used to their new location and the people they are supposed to protect, and introductions are best done in person with you by their side. Supervision is especially important when it comes to spending time with small children for the first several months.
Are You Ready?
Introducing your protection dog to its new home is an exciting and fun time. You alone have the opportunity to make its first impression the best one possible. How you begin life at home for your protection dog goes a long way in setting the tone for how it lives with you, your family, and your friends.
Are you ready for your protection dog to make its grand entrance?
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I asked for some background and this is what was sent:
Steve Scott – After his service in the Army, Steve pursued a career in Law Enforcement, earning honors as the head trainer of his Police Department’s K9 Unit. Steve’s real-world police K9 experience is what sets Scott’s Police K9 apart from other protection dog companies. With Steve’s dog training expertise and his access to the top European kennels, our Family Protection Dogs and trained Police Dogs are second to none.
This is a fabulous piece of advice. From, I have to say, someone who jolly well knows what he is talking about!
More please!
An outstanding walk.
Tom came to Learning from Dogs a short while ago and signed up to follow the blog. As is usual, I went across to his blog in order to leave a thank-you note. I was flabbergasted at what I saw. Tom and his two dogs were walking across Spain. He called his blog Chica’s Challenge and this is what he wrote on his home page.
First, Tom decided he wanted to do a long walk.
Then he thought Spain would be nice as it has to be in winter.
And he’d like to take Chica, our podenco.
As an afterthought, he said, “Maybe we could raise some money?”
“Who for?” I asked.
“Well, as I’m taking Chica and it’s in Spain, I guess for Spanish podencos.”
“Great idea! I’ll write the blog!”
I wanted to follow his posts and did so.
Then I wanted to republish a post and asked Tom if I had his permission to so do.
“Of course”, came the reply.
So I am going to republish the post that was Day 7 of the walk.
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One dog and her man walking across Spain, raising money for their podenco friends.

The last two days were non-walking days, one for bad weather and another to move base again. Now we have the luxury of being in a house for a while in Jimera de Libar, a village we know well.

So the day started with the drive back to Jimena and the weather looked reasonable. Again, Merlin refused to be left so the three of them set off up the path, climbing steadily for the first hour and a half.




The path eventually levelled out and passed beneath the rocky outcrops of the Altos de Paneron and Cerro de Marin. After a bare rocky sections where the route was harder to determine, they went into dense forest of oak and Spanish fir (we love these and call them lollipop trees because of their shape). Both dogs in great form, but Tom was mean and moody :).



Dark clouds were gathering from all directions but the view to the coast was still impressive. However, it wasn’t long before the rain began and the temperature dropped.

Fortunately the rest of the route was on a well-defined and signposted track, winding down through the cork oaks in the midst of the Los Alcornacales. It was here deep in the forest that I eventually picked them up. I had forgotten that smaller Spanish roads aren’t always roads as I know them and the last five and a half miles I was driving along a rough track with no mobile signal, not at all sure I was in the right place. Even though we have a 4×4, I made very slow progress and it was with considerable relief that I found them, damp but completely unconcerned.
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In the original some of the photographs were side-by-side but in copying them across I chose to enlarge them.
The start of Tom’s walk may be seen here and I thoroughly recommend that you read it in full.
I shall continue to follow Tom’s walk and may republish another post.
A few photos from home.

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Wonderful animals!
But everything to do with staying fit and healthy.
There are many things that I read first thing in the morning before I am dressed. Ninety-nine percent of them I don’t share with you.
But the following caused me to a) reflect on whether I was guilty of doing this, and b) how many others know of this.
One of the results of having 4,000 (bar 25) followers of this place is that I feel a certain obligation to share certain news.
It was published on The Conversation and is free to reproduce.
So here goes:
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Exercising too much, too hard can lead not only to burnout but sometimes to a serious condition that can harm the kidneys.
By , Associate Professor of Exercise and Sports Science, Wayne State University, January 24th, 2020.
Every 365.25 days, when the Earth completes a full orbit around the Sun, we humans have the opportunity to hit the reset button and become fitter, finer versions of ourselves. As usual for January, social media is humming with advice on how to eat better, exercise regularly, lose weight and remain healthy. We feel particularly invincible at this time of year, armed with renewed vigor and motivation to purge ourselves from previous indulgences and our couch-potato ways.
The New Year is also the time when our overzealous, instant-gratification selves emerge, and we do too much exercise too soon to make up for lost time. Exhaustive muscular work, especially following a period of inactivity, can cause mechanical and chemical disruptions to muscle cell membranes which trigger the muscle cells to burst.
I am an exercise physiologist and sports medicine specialist who studies exercise-associated collapse. I am seeing and hearing of more incidents of skeletal muscle ruptures that are causing harm in other parts of the body.
This information is not designed to scare people back onto the couch. The key take-away from highlighting these cases is to remind athletes, coaches and mere mortals that the desired physiological response to a training stimulus requires both a gradual buildup period and period of recovery in between training sessions.

More than muscle injury
The medical term for skeletal muscle cell rupture is “rhabdomyolysis,” or “rhabdo” for short. When muscle cells rupture or explode, the intracellular contents are released into the bloodstream. These cellular contents include enzymes, such as creatine kinase; electrolytes, such as potassium; and proteins, such as myoglobin.
Myoglobin, in particular, is a big, red protein that can block the kidney filtration system, or renal tubules, that serve as kidney plumbing. It also can dissociate into toxic byproducts that injure kidneys. In rare cases, too much myoglobin in the bloodstream can stop kidney function altogether, as happened with a 27-year old marathon runner who died from kidney failure.
In a study we conducted on college swimmers, we saw a cluster of rhabdomyolysis, in which six out of 34 swimmers were hospitalized after participating in a 20-minute or so “arm competition” to see how many pull-ups, rows and bench presses they could complete. Cases of “symptomatic rhabdo,” or those needing medical treatment, appear to be increasing within collegiate sports teams at an alarming rate, with the characteristic appearance seen in football players returning to January practice after a season-ending holiday layoff.
To date, 17 cases of team rhabdo have occurred from doing “too much, too soon, too fast” and include a variety of sports such as football, swimming, lacrosse, soccer, track, basketball, softball, volleyball and golf.
Noncompetitive athletes affected too
So, what about us mere mortals trying to get back in shape? Any physical activity that is either new or excessive can cause symptomatic rhabdo. Excessive gardening, weightlifting, CrossFit type activities and even a routine Army physical fitness test have triggered symptomatic rhabdo with kidney injury.
Over 90 cases of rhabdo have been documented after spinning, while 119 high school students in Taiwan ended up in the emergency room after their teacher made them complete 120 push-ups within five minutes. Thus, harmful muscle cell rupture can occur after any degree five minutes to 36 hours of exuberant and/or unaccustomed physical activity.
In combination, gradual training and appropriate recovery allow beneficial muscular, cardiovascular and body composition adaptations to occur, such as building muscle, increasing fitness and losing body fat. Our research confirms that a two-week gradual introduction into training after a layoff is required for muscle cell membranes to fully adapt to training stress.
Subclinical rhabdo, or muscle breakdown without acute kidney injury or debilitating symptoms, is common and represents the typical response to training which does not require medical treatment. However, hard exercise, especially following a layoff, with the following signs or symptoms within one to two days requires an appropriate medical examination:
There are risk factors which increase the likelihood of developing rhabdo following a workout. These risk factors include exercising in the heat, dehydration or overhydration, binge drinking, excessive coffee consumption, extreme dietary practices (vegetarian or high [protein] https://doi.org/10.1097/JSM.0000000000000310)) and possessing the sickle cell trait. Both men and women can develop symptomatic rhabdo, although we see more cases in men. Smaller arm muscles appear more susceptible to rupture after five to 30 minutes of exercise than bigger leg muscles for reasons that remain unclear.
Although symptomatic rhabdomyolysis is uncommon, this emergent complication of exercise should be on everyone’s radar since cases are on the rise. We coaches, trainers, scientists, practitioners and others encourage everyone to reap the joys and benefits of regular exercise training. However, we caution against exercising too much too soon. Self- (or coach-) inflicted skeletal muscle cell explosions are fully preventable with adherence to smart, physiologically sound approaches to training.
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Now there’s an element of me not really understanding this (and I haven’t yet watched the video) but that’s no reason not to share it with you.
What do you think? Wiser to share it or too much a case of worrying? Tamara Hew-Butler certainly knows all about this.
This is another astounding article about a dog.
It happens to be in Georgia but from the dog’s point of view it could be anywhere in the world.
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Such a thoughtful pup.
By Stephen Messenger
Published On 01/22/2020

Unfortunately, there are still some drivers out there who apparently don’t know how to treat pedestrians with the respect that they deserve.
But this little dog is doing his best to set them straight.
The other day, Beqa Tsinadze happened upon a curious scene in the town of Batumi, Georgia. There, at a clearly marked crosswalk, a group of young kids were waiting for cars to yield so they could safely cross the road.

Regrettably, though, it seems that many drivers weren’t eager to extend that courtesy without being told to.
So, that’s exactly what this dog did — taking on the role of crossing guard on the kids’ behalf. The moment was captured on video.
The thoughtful dog tackled the situation like a pro. But apparently this wasn’t just a one-time thing.
Tsinadze shared another video of the same dog stopping traffic and escorting yet another group of kids across the street.

Though it’s unclear why the pup came to adopt the role of crossing guard, it may be as a way of saying thanks.
According to Georgian media, the dog arrived to the area as a helpless stray a few years back, and has since endeared himself to members of the community who have taken it upon themselves to care for him.
The report above states that the dog goes by several names among folks in the neighborhood who know him — but there’s no doubt that you’d be safe in calling him a very good boy.
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Another wonderful report.
I’m sorry, I ought to write more but I would only be waffling!
A widely-reported study shows the depth to which dogs understand us.
I have seen this reported both in The Smithsonian and Mother Nature News.
I have included both!
I’ll comment at the end of the articles.
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By Brigit Katz

Dogs are famously good at interpreting human signals, whether communicated verbally or through gestures. But much of what we know about our furry friends’ comprehension of social cues focuses on pet dogs, which share close relationships with their owners and are trained to follow commands. Now, a study published in Frontiers in Psychology, suggests that stray dogs can also understand human gestures, indicating that this ability might be innate.
The new research took place on the streets of several regions in India, which is home to some 30 million stray dogs. Coexistence between canines and humans there is not always peaceful; people have been known to attack street dogs, and vice versa. Around 36 percent of the world’s annual rabies deaths occur in India, most of them children who came into contact with infected dogs.
To better manage the country’s street dogs, it’s essential to gain further knowledge of their behavior, Anindita Bhadra, study co-author and animal behaviorist at the Indian Institute of Science Education and Research Kolkata, tells Liz Langley of National Geographic. So she and her colleagues set out to discover whether strays, which have never undergone specific training, are able to understand humans in a similar way to their pet counterparts.
The researchers took to the streets equipped with two bowls; one contained chicken and the other was empty but had been rubbed with raw chicken, transferring the food’s scent. The bowls were covered with pieces of cardboard and handed to an experimenter who did not know which one contained the snack. This researcher would approach a stray dog, place the bowls on the ground and point at one of them, sometimes momentarily, sometimes repeatedly.
In total, the researchers studied 160 adult strays. Around half of them refused to get close to either bowl, perhaps because they had negative interactions with humans in the past, the researchers speculate. But of the dogs that did approach the bowls, approximately 80 percent went to the one to which the experimenter had pointed. Whether the researcher had pointed to the bowl briefly or repeatedly did not seem to matter. This response, according to the study authors, suggests that untrained stray dogs are “capable of following complex pointing cues from humans.”
Dogs share an intertwined evolutionary history with humans, with domesticated pooches emerging at least 10,000 to 15,000 years ago, though some experts have argued for an even earlier date. This close contact has prompted dogs to develop a number of skills that allow them to communicate with people, including interpreting human emotion. Still, Bhadra says, the researchers found it “quite amazing” that stray dogs without a history of close human interaction were able to “follow a gesture as abstract as momentary pointing.”
“This means that they closely observe the human, whom they are meeting for the first time, and they use their understanding of humans to make a decision,” Bhadra adds. “This shows their intelligence and adaptability.”
Because some dogs seemed anxious and were wary of approaching the researchers, it’s not clear how a dog’s personality—and past experiences—might affect its ability to interpret human signals. But this ability does not appear to be entirely dependent on training, the study authors say, which in turn should inform efforts to manage stray dogs.
“They are quite capable of understanding our body language and we need to give them their space,” Bhadra says. “A little empathy and respect for another species can reduce a lot of conflict.”
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Mother Nature News had a second picture in their broadly-similar article. Indeed, I’m going to republish this article as well. For although they are of the same story they offer a slightly different account.
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A new study shows these feral canines are paying close attention.
By Starre Vartan January 21, 2020

Dogs were likely the first animals that human beings domesticated — scientific guesses vary as to whether that was 10,000 years ago in Europe or 30,000 years ago in Asia (or, as one theory goes, humans tamed grey wolves two separate times). Regardless, they have been our companions for much of human history, and all of modern history. We have evolved together.
And that longstanding connection shows up in feral dogs.
Behavioral biologist Dr. Anindita Bhadra of the Indian Institute of Science Education and Research in Kolkata, India, revealed this by studying stray dogs in several Indian cities. In the experiment, Bhadra and her colleagues would find a solo stray dog and put two covered bowls on the ground nearby. They they’d simply point to one of the bowls; some did this just once, others did it a few times.
The researchers, who published their work in Frontiers in Psychology, recorded the dogs’ reactions. Half the dogs seemed nervous, and didn’t look at or come close to either bowl. But the other half — noted as less anxious dogs by the researchers — approached the bowls. Of those friendlier dogs, about 80% went to the bowl the researcher pointed at. As long as the dogs weren’t too scared of the people, they were easily able to interpret what the pointing meant.
“We thought it was quite amazing that the dogs could follow a gesture as abstract as momentary pointing,” Bhadra said in a news release. “This means that they closely observe the human, whom they are meeting for the first time, and they use their understanding of humans to make a decision. This shows their intelligence and adaptability.”

In another study, three out of 13 untrained 8-week-old wolf puppies spontaneously retrieved a ball for a person who threw it, as MNN’s Mary Jo DiLonardo explains. It was a small study, and a low percentage of retrieving puppies, but it was an unexpected result as these weren’t domesticated dogs. “It was so unexpected, and I immediately knew that this meant that if variation in human-directed play behavior exists in wolves, this behavior could have been a potential target for early selective pressures exerted during dog domestication,” Christina Hansen Wheat, a biologist at Stockholm University, said.
Her observations show that playing with people may be a very old trait for wolves, that could reflect how our human ancestors first got to know them. This playful behavior may have sparked humans’ interest in domestication. If a dog could fetch a stick or other thrown object, they could be quite useful to hunting humans.
Of course, their adorable, big puppy-dog eyes and floppy ears (both traits that have become accentuated over time as dogs evolved) are among the reason we are still drawn to dogs today. (It also helps that they’re great listeners.)
But long before that happened, dogs served an important purpose — assisting people in locating and retrieving prey, and serving as eyes and ears for an intruder. Simple tasks like showing they can follow directions or fetch an object may have moved prehistoric dogs from outside the fire circle to within it, which is why understanding these behaviors are so important.
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If we go back into the mists of time then prehistoric wolves (or dogs) learnt to bond with early humans because it served both their interests to so do. Humans became much more adept at hunting and wolves obviously became the benefactors of food!
Now dogs are so well bonded to human gestures that even non-domesticated dogs understand the signals that we humans put out. I say ‘non-domesticated’ but in a real sense all dogs are domesticated. It would be more accurate to say that these are dogs who do not have a home with humans.
The oldest human-animal relationship by far!
Interesting article about calculating a dog’s age.
It’s a well-known ‘calculation’ that a dog’s age is seven years for every human year. But it’s wrong; the scientific result is more complex.
But rather than me say it, I’ll hand it over to Christian Yates of the BBC who on the 6th January this year published an article on this subject.
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By Christian Yates, January 6th, 2020
If your dog has been alive and kicking its paws about for a decade, the widely held belief is it has aged as much as a human would have done over 70 years. This conversion factor – each year of a dog’s life accounting for seven human years – comes from dividing human life expectancy of around 77 by the canine life expectancy of around 11.
The underlying assumption is that each calendar year a dog lives through is equivalent to seven human years at any stage of a dog’s life. But new research suggests that things aren’t so simple. And if we look at some basic developmental milestones, it’s clear why.
For example, most dog breeds reach sexual maturity between the ages of six and 12 months – the upper end of that range corresponding, by the traditional conversion, to a human age of seven. And at the other end of the spectrum, although unusual, some dogs have been known to live for over 20 years. Under the “factor-of-seven” conversion rule, this would equate to an unfathomable 140 human-equivalent years.

To make matters more complicated, dogs’ life expectancy depends significantly on the breed. Smaller dogs tend to live significantly longer, suggesting that they age more slowly than bigger dogs.
All of this raises the question of what exactly we mean by age. The most obvious way to describe it is simply the length of time that has passed since birth. This is known as the chronological definition of age.
When it comes to comparing animal ages across species, the biological definitions of age are far more useful than their chronological counterparts
However, there are other descriptions. Biological age, for example, is a more subjective definition, which relies on assessing physiological indicators to identify an individual’s development. These include measures like the “frailty index” – surveys that take into account an individual’s disease status, cognitive impairments and levels of activity.
Then there are the more objective ageing biomarkers, such as levels of gene expression (genes produce proteins at differing rates at different stages of life) or numbers of immune cells. The rate at which biological age increases depends on genetically inherited factors, mental health and lifestyle.

For example, if you’ve spent a lot of time eating junk food and smoking cigarettes instead of taking exercise and eating healthily, the chances are your biological age will exceed your chronological age. Or, you might be a 60-year-old with the body of a 40-year-old if you’ve looked after yourself well.
A dog’s life
When it comes to comparing animal ages across species, the biological definitions of age are far more useful than their chronological counterparts. Knowing a hamster is six weeks old doesn’t give you a good picture of that animal’s life stage, even if you know the life expectancy of a hamster is only three years. Learning that a hamster has reached an age where it can reproduce gives a much better picture of its level of maturity.
The authors of the new ageing study suggest that a sensible way to measure biological age is though so-called “epigenetic clocks” – changes to the packaging of our DNA that accumulate over time in all mammals.

In particular, “methylation” – the addition of methyl groups (a carbon atom bonded to three hydrogen atoms) to DNA – seems to be a good indicator of age. Many prominent physiological markers, such as the development of teeth, seem to occur at the same levels of methylation across different species. So by matching the levels of methylation in Labrador retrievers and humans, the researchers derived a formula to map dog age to its human equivalent.
That formula is: human equivalent age = 16 x ln(dog’s chronological age) + 31.
Here “ln” represents a mathematical function known as the natural logarithm. The logarithm function is well-known in the non-linear scales for energy released during earthquakes (Richter) or for measuring sound (decibels). It comes in useful for measuring quantities whose sizes vary over many orders of magnitude. It’s even possible that a logarithmic experience of the passing of time might explain why we perceive time speeding up as we get older.
A handy short cut is to remember that the first dog year counts for 31 human years
In the graph below, you can see how the natural logarithm works to convert the years a dog has lived (dog age) into the equivalent human age in the red dashed curve. The curve suggests that dogs mature extremely rapidly at first, but that their ageing then slows down, meaning that most of their lives are experienced as a form of protracted middle age.
A handy short cut is to remember that the first dog year counts for 31 human years. Then, after that, every time the dog’s chronological age doubles, the number of equivalent human years increases by 11. So eight calendar years represents three “doublings” (from one to two, two to four and then four to eight) giving a dog age equivalent of 64 (that’s 31 + 3×11).
This useful approximation is plotted as the black curve on the conversion figure below. The green line represents the discredited factor-of-seven rule that suggests unrealistic ages at the higher end of the dog age spectrum.

Most dog lovers will already have suspected that the human-to-dog age relationship is non-linear, having noticed that, initially, their pets mature much more quickly than the linear factor-of-seven rule suggests.
A more sophisticated refinement to the factor-of-seven rules has suggested that each of the dog’s first two years correspond to 12 human years while all subsequent years count for four human equivalents. The blue curve in the above figure, which represents this ad hoc rule, shows better agreement with the new logarithmic law.
In practice the new molecular insights into human-to-dog age conversion encapsulated by the logarithmic law suggest that dogs move into middle age even more rapidly than most dog-owners would have suspected. It’s worth bearing in mind, when you find that Rex is reluctant to chase the ball like he once did, that he’s probably got more miles on the clock than you’ve been giving him credit for.
Christian Yates is a senior lecturer in mathematical biology at the University of Bath. He is also the author of The Maths of Life and Death.
This article originally appeared on The Conversation, and is republished under a Creative Commons licence.
ooOOoo
I don’t know about you but I found this article extremely interesting.
Well done the BBC!