Many dog breeds, like the pit bull, have bad reputations, but any type of dog might bite someone in Fort Pierce. As for breeds being prone to attack, statistics indicate that Chihuahuas bite people the most, followed by bulldogs, pit bulls, German shepherds, Australian shepherds, Lhasa apsos, Jack Russel terriers and Cocker spaniels. What dogs that attack often have in common is that they were not spayed or neutered according to Canine Journal. The size of a dog, however, could influence the severity of your injuries and emotional trauma.