Massive study of pet dogs shows breed does not predict behaviour

Massive study of pet dogs shows breed does not predict behaviour

Swimming is for the dogs: analysis shows that doggy breed does not predict behaviour, this kind of as an eagerness for a doggy paddle.Credit score: Kay MacCoubrey/Getty

Puppy fanatics have extensive assumed that a dog’s breed designs its temperament. But a sweeping study evaluating the conduct and ancestry of additional than 18,000 puppies finds that despite the fact that ancestry does affect behaviour, breed has a lot fewer to do with a dog’s personality than is normally supposed1.

“When you adopt a canine based mostly on its breed, you are getting a pet that seems to be a specific way,” suggests co-creator Elinor Karlsson, a computational biologist at the University of Massachusetts in Worcester. “But as significantly as behaviour goes, it is form of luck of the draw.”

Variety more than function

Which is partly for the reason that breeds are a thing of a present day invention. Human beings have been shaping how canines appear and behave considering that domestic dogs initially developed from wolves much more than 10,000 many years back. But for most of that time, these efforts were being concentrated on dogs’ operating capability — how perfectly they herded livestock, guarded from danger or pulled sledges, for example.

Breeds as we feel of them currently — exclusive canines this sort of as beagles, pugs and Labradors — are a by-item of more new evolutionary meddling. Commencing around 200 years ago, pet fans in Victorian England started inventing breeds by actively deciding upon for canine traits that they located aesthetically satisfying.

This experimentation developed today’s breeds. Modern day purebred puppies are outlined by their appears to be like, but breed is also imagined to influence temperament. The American Kennel Club, for occasion, describes pugs as “mischievous” and border collies as “affectionate”.

But, as Karlsson factors out, “anyone who’s owned 8 dogs from the similar breed will inform you all about their unique personalities”. Wanting to get a much better perception of how breed influences conduct, Karlsson and her colleagues surveyed hundreds of pet dog house owners about their pets’ backgrounds and pursuits, ranging from whether or not they experienced a propensity to consume grass to how probably they were to chase toys. The researchers then sequenced the DNA of a subsection of the study puppies to see whether ancestry could be linked to behaviour.

The team identified that some characteristics were being additional prevalent in sure breeds. For example, in contrast with a random puppy, German shepherds were more simply directed beagles, not so a great deal. And the authors’ genetic experiments exposed that mixed-breed puppies with a specific ancestry ended up much more likely to act in distinct methods. Mutts with St Bernard ancestry, for occasion, were extra affectionate, whereas mutts descended from Chesapeake Bay retrievers had a penchant for wrecking doors.

Photo of Sandy, one of the mixed-breed dogs featured in the study for this story.

Among the the mutts who contributed data to the new examine was Sandy, whose heritage features Australian cattle dog (21.4%) and collie (8.6%).Credit: Angela Lek

But, on normal, breed explained only all over 9% of the variation in how a pet behaved, a quantity “much smaller sized than most individuals, including me, would have predicted,” claims Karlsson. Specially reduced was the connection concerning breed and how most likely a dog was to exhibit intense behaviour, which could have implications for how culture treats “dangerous” pet breeds, says Evan MacLean, a comparative psychologist at the College of Arizona in Tucson who was not included in the study.

“We talk about breeds like they are categorically distinctive,” he claims. “But in reality, which is not the situation.”

Genetic examination unveiled 11 locations of the genome that are linked to particular behaviours. A tendency to howl, for illustration, was affiliated with a region in close proximity to two genes whose human analogues are involved in speech. The most important link was concerning a region of the genome that in people is concerned in cognitive performance — but in puppies elevated the likelihood of finding caught guiding objects.

These genetic characteristics have been close to for a lot longer than breeds have existed, claims Kelsey Witt, a inhabitants geneticist at Brown College in Providence, Rhode Island. “At 1st glance, it appears astonishing that breed isn’t a very good predictor” of conduct, she says. “But when you believe about how latest breeds are, it would make feeling.”