Although some traits appeared to coincide with existing beliefs about breeds, others contradicted deep-seated stereotypes. Labrador and golden retrievers, on average, scored high on “human sociability” — a measure of how receptive a dog is to unfamiliar people. That finding goes hand in hand with those breeds’ reputations as friendly dogs. But American pit bull terriers, a breed that has been outlawed in some cities and is often not allowed to live in apartment complexes because of the belief that it is aggressive and destructive, also scored high on human sociability, the study found.