Cute giants! The study found that heavier dogs are likely to be significantly less aggressive

If you are afraid of dogs, you may find yourself wary of large dogs such as Dobermans or Great Danes.

But the results of a new study could refocus your attention away from these breeds and toward tiny puppies.

Researchers from the University of São Paulo revealed that heavier dogs tend to be more obedient than lighter pets.

In contrast, small breeds with short snouts like pugs, bulldogs, and shih tzus are the most misbehaved breeds, according to the study.

If you are afraid of dogs, you may find yourself wary of large dogs like Dobermans or Great Danes (stock photo). But the results of a new study could refocus your attention away from these breeds and toward tiny puppies

What are the most aggressive dog breeds?

Experts from Helsinki studied the behavior of 9,000 dogs, and claimed that the most aggressive breeds were:

  1. collie rough
  2. miniature poodle
  3. mini snoozer
  4. German shepherd
  5. Spanish water dog
  6. Lagotto
  7. Chinese crested
  8. Central German Spitz
  9. Toler cotton
  10. Wheat terrier
  11. else
  12. Pembroke Welsh Corgi
  13. cairn
  14. border collie
  15. Finnish Lapphund
  16. Chihuahua
  17. collie incontinence
  18. Jack Russell Terrier
  19. Staffordshire bull terrier
  20. Shetland Sheepdog
  21. Laponian Herder
  22. golden retriever
  23. Labrador Retriever

In the study, the team set out to understand the factors that influence aggression in pet dogs.

They recruited 665 pet dogs across 57 breeds of different sizes.

Dog owners completed three online questionnaires — one about themselves, one about their pet’s characteristics, and one about the nature of any aggressive behaviour, such as barking or attacking.

The results showed that the heavier the dog, the less likely it was to show aggressive behaviors.

In fact, for every additional 2.2 pounds (1 kg) of body mass, aggressive behavior was found to decrease by 3%.

However, small dogs with short snouts were found to be the most aggressive.

“Aggressiveness towards the owner was 79% more likely among brachycephalic dogs than among medium-headed dogs,” said Flavio Arosa, first author of the study.

Small-headed dogs have short, compact faces and include Pugs, Bulldogs, Boston Terriers, and Shih Tzus.

In contrast, medium-headed breeds including Beagles, Golden Retrievers, and Labrador Retrievers have more intermediate skulls.

The sex of the pet also seems to affect its aggression.

“The likelihood of aggressive behavior towards the owner was 40 percent lower among female dogs compared to males,” Arosa said.

In addition, the team found a link between the characteristics of the owner and the aggressiveness of his pet.

Aggression in dogs was 73 percent more frequent among male owners than among female owners, while dogs who were walked every day by their owners were less aggressive.

According to the study, small breeds with short snouts such as pugs, bulldogs, and shih tzus are the most misbehaved breeds.  Pictured: a French bulldog wearing a muzzle

According to the study, small breeds with short snouts such as pugs, bulldogs, and shih tzus are the most misbehaved breeds. Pictured: a French bulldog wearing a muzzle

However, the researchers caution that these findings are not cause-and-effect associations.

“We’ve found relationships, but it’s impossible to say which comes first,” explained Mr. Arosa.

In the case of the “walking the dog” factor, for example, it could be that people were walking their dog less because the animal was aggressive, or the dog might have become aggressive because the owner wasn’t taking enough of it.

Traits such as weight, height, craniofacial morphology, sex, and age influence the interaction between dogs and their environment.

“They may spend more time indoors because of them, for example.”

The researchers hope the findings will highlight that dog behavior is not unique to the animal, but rather is the result of the interaction between the animal and its disease.

“The environment and the relationship between the owner and the pet, as well as conformation, are all factors that influence how pets interact with us and how we interact with them,” said Professor Briseida de Resende, author of the study.

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How old is your dog really in “human years”?

A dog expert says the oft-pronounced statement that one dog year equals seven human years is incorrect.

Instead, the equation is more precise and based on the dog’s cognitive and behavioral traits over time as well as its breed.

A new study reveals that a dog becomes a teenager at just six months of age, a full-fledged adult at two and becomes “big” around age seven.

A review of previous studies looking at the effect of dog age on pet health has been published in the journal Frontiers in Veterinary Science.

The review was conducted by Dr Naomi Harvey, Director of Research at Dogs Trust and an academic at the University of Nottingham.

And just because dogs live seven times shorter than humans, she says, doesn’t mean every trip around the sun is worth seven for a dog.

“Dogs mature faster than we do,” says Dr Harvey.

“Many one-year-old dogs have reached their full height and most will be past or nearing the end of puberty so they are definitely not the equivalent of a seven-year-old! “

Rather than using the simplistic factor of the seven equation, Dr. Harvey sought to determine whether the dog was a puppy, juvenile, adult, senior, or geriatric.

My findings show that a 1-year-old dog is a juvenile who has just finished puberty, which is closer to a 15-year-old human.

But after just 12 months, at two years of age, dogs reach full maturity in much the same way as a 25-year-old.

Dr. Harvey found that dogs can be considered to have entered their prime years at age 7 and are considered to be seniors at age 12 and over.

Pictured is how different metrics change a dog's behavior over time.  green shows how the brain develops and then begins to deteriorate in the early years;  The orange color shows how some traits, such as cognitive decline, increase exponentially in a dog's old years;  The red color shows the slow decline in the dog's activity and alertness

Pictured is how different metrics change a dog’s behavior over time. green shows how the brain develops and then begins to deteriorate in the early years; The orange color shows how some traits, such as cognitive decline, increase exponentially in a dog’s old years; The red color shows the slow decline in the dog’s activity and alertness

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