Dog Breeds Rated for Feistiness

"There is some evidence that smaller breeds are more often the targets of aggression by other dogs," she added, "and small breeds, particularly Dachshunds, are more prone to injury due to rough handling by children, so this form of aggression among small breeds may be a learned response due to negative past experiences."

Other breeds with a greater tendency to bite humans included Jack Russell Terriers, Australian Cattle Dogs, American Cocker Spaniels and Beagles.

On the "least aggressive" end of the spectrum were Basset Hounds, Golden Retrievers, Labrador Retrievers, Siberian Huskies, Bernese Mountain Dogs, Brittany Spaniels, Greyhounds and Whippets. Interestingly enough, several of these dogs also rated low for "watchdog behavior" and "territorial defense" behaviors, suggesting that they tend to be lovable family pets, but are less vigilant watchdogs than Chihuahuas and Dachshunds.

Having a tough appearance, however, can make up for a lack of skill.

"Certain breeds, through either their reputation or their size, are inherently more intimidating than others even if they show little or no aggressive behavior," Duffy explained.

A more complete list of the breeds included in the study and how they rated may be found here.

As in humans, behavioral patterns in dogs seem to arise from a combination of environmental influences and genetics. The DNA component is supported in a separate study published this week in the journal Genetics.

Paul Jones, a Mars Veterinary genetics researcher at the Waltham Center for Pet Nutrition, and his co-author identified locations in a dog's DNA that contain genes believed to contribute to behavior, trainability and longevity, as well as body and skull shape, weight, fur color and length.

"By applying this research approach, we may be able to decipher how genes contribute to physical or behavioral traits that affect many breeds," said Jones, who indicated future applications might include tailor-made foods and medicines, along with specific recommendations to individuals about what would be the "most lifestyle-appropriate pet for an owner."

Duffy countered that "just because there is a genetic component to behavior does not necessarily mean that it is predestined."

"Anyone looking to bring a dog into their home should find out as much as possible about the individual dog's history and temperament," she advised. "Certainly some breeds are better with children than others on average. However, it wouldn't make sense to pass up a well-socialized, well-trained, non-aggressive Rottweiler for an atypically aggressive Labrador Retriever."

Related Links:

Jennifer Viegas' Blog: Born Animal

Center for the Interaction of Animals and Society

How Stuff Works: How to Solve Dog Behavior Problems

American Kennel Club