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Animal People, Inc. posted an update 6 years, 6 months ago
http://www.care2.com/causes/study-finds-its-a-hormone-not-the-breed-that-makes-dogs-aggressive.html
Study Finds It's A Hormone, Not The Breed, That Makes Dogs Aggressive | Care2 CausesA study found that leash-aggressive dogs of all breeds had higher levels of the hormone vasopressin which, just as it does in humans, causes aggression in dogs.