American Bulldogs are a known breed that will destroy furniture and shoes if they are not given enough to do and this is yet another reason too much isolation is disastrous for this breed. Fear- or aggression-causing triggers can include other dogs, children it does not know, postal workers, and strangers. An American Bulldog does not trust anyone at first sight and must learn from its master what is a threat and what is not, and a dog of this breed must learn when to be territorial and when everything is okay. In this facet its temperament is similar to other longer established and better-known utility breeds used for livestock guarding, like the Rottweiler, itself a German type of "bulldog"; another name for the breed being ""Rottweiler Metzgerhund,"" or ""butcher's dog from Rottweil"".