May 22, 2009 -- A floppy-eared, innocent-looking breed may be one of the world's most aggressive dogs, according to a new study that found English cocker spaniels tend to be more hostile than other breeds. The discovery adds to the mounting evidence that aggressiveness is an inherited characteristic, suggesting that genes and breeding practices can both help determine how a dog will behave. "In our country and according to our database, the English cocker spaniel is the breed that shows more aggression problems," lead author Marta Amat told Discovery News. Amat, a researcher in the School of Veterinary Medicine at the Autonomous University of Barcelona, and her colleagues analyzed 1,040 cases of canine aggression brought to a nearby veterinary teaching hospital from 1998 to 2006. Of those cases, the majority of cases were attributed to English cocker spaniels, Rottweilers, Boxers, Yorkshire terriers and German shepherds. Related Content:
Probing the data further, Amat and her team discovered that English cocker spaniels were more likely than other dogs to act aggressively toward their owners as well as unfamiliar people. In contrast, dogs with reported behavior problems from other breeds tended to act aggressively toward other dogs. Among the English cocker spaniels, golden varieties and males were found to be the most hostile. The findings, published in the latest Journal of Veterinary Behavior, confirm an earlier study conducted by a separate Spanish team from the University of Cordoba, which also found males and golden English cocker spaniels were more aggressive than females or those with black and mixed-color coats. In terms of coat color, Amat explained that the coat pigment melanin shares a common biochemical pathway with dopamine and other brain chemicals involved in the control of aggressive behavior. Get More NewsSpiders, Scorpions Among World's Oldest CreaturesMany creepy crawlies have been on Earth much longer than previously believed.Blood-Sucking Vampire Bats Sing DuetsWhite-winged vampire bats "harmonize" with separated roost mates.Oldest Hebrew Writing Possibly FoundAncient inscriptions on a 3,000-year-old pottery shard could make history.Rare, Prehistoric-Age Reptile Found in N.Z.A tuatara has been spotted on the New Zealand mainland for the first time in 200 years.Iceman Has No Living RelativesOetzi, the 5,300 year-old frozen mummy, left no living genetic legacy.SLIDE SHOW: Landscapes of TerrorWhat makes a place feel scary? There are scientific explanations.It's Official: People Are Warming the PolesHumans are conclusively to blame for polar warming, say scientists.Eight-Armed Animal Preceded DinosaursWhat may be one of Earth's first animals was no bigger than a coaster and had eight arms.Phoenicians Live on in People's GenesOne in 17 Mediterranean men may be descended from ancient Phoenicians.Pesticides, Fertilizers Linked to Frog DeclineA pesticide is found to promote parasites among amphibians.Hubble Telescope Taking Photos AgainThe Hubble Space Telescope is once again snapping stunning photos of the universe.Andean Mummy Hairs Show Hallucinogen UseScientists find direct evidence of hallucinogenic drug use among ancient Andeans.Opals on Mars Reveal Planet's Long Wet PastOpals found on Mars suggest the planet has been wet for much longer. |
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