Smaller, older and male dogs are more likely to be aggressive and growl, snap and bark at humans, a study has found.
Some breeds are also more likely than others exhibit aggressive behaviour, with Long-Haired Collies, like Lassie, the most aggressive of all breeds.
However, Labradors and Golden Retrievers, beloved for their docile temperament and gentle nature, were found by scientists to be the least aggressive breeds.
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When comparing the Rough Collie (left) with the Labrador (right), the least and most aggressive breeds, respectively, the researchers found the former is 5.44 times more likely to be aggressive. '
The below list was compiled by researchers from helsinki who studied the behaviour of more than 9,000 et dogs.
However, it only includes 23 breeds and is not exhaustive.
For example, notable breeds like Rottweilers, Dobermans and British Bulldogs are not included.Rough Collie Miniature Poodle Miniature Schnauzer German Shepherd Spanish Water Dog Lagotto Chinese Crested German Spitz Mittel Coton de Tulear Wheaton terrier other Pembroke Welsh Corgi Cairn Terrier Border Collie Finnish Lapphund Chihuahua Smooth Collie Jack Russell Terrier Staffordshire Bull Terrier Shetland Sheepdog Lapponian Herder Golden Retriever Labrador Retriever
A study of more than 9,000 pets covering 24 breeds was run by researchers at the University of Helsinki.
It revealed the aspects of a dog's personality which affect its likelihood to exhibit aggressive behaviour towards people.
Small dogs were found to be more likely to behave aggressively than mid-sized and large dogs, but due to their size, are often not seen as threatening and therefore go unaddressed.
The study, published in Scientific Reports, also found male dogs are more aggressive than females and neutering them has no impact.
How experienced the dog owner was also impacts on the chance of aggressive behaviour from a pet pooch, researchers found, with the first dogs of novice pet owners being more likely to behave aggressively.Insurance Loans Mortgage Attorney Credit Lawyer
The study also indicated dogs that spend time in the company of other canines behave less aggressively than those that live without other dogs in the household.
But dog breed is the factor which influences aggressive behaviour more than any other variable, except for advanced age.
'In our dataset, the Long-Haired Collie, Poodle (Toy, Miniature and Medium) and Miniature Schnauzer were the most aggressive breeds,' says Professor Hannes Lohi from the University of Helsinki.
'Previous studies have shown fearfulness in Long-Haired Collies, while the other two breeds have been found to express aggressive behaviour towards unfamiliar people.
'As expected, the popular breeds of Labrador Retriever and Golden Retriever were at the other extreme.
'People who are considering getting a dog