According to the American Society for the Prevention of Cruelty to Animals (ASPCA), aggressive dogs are the number one problem dog owners face. Aggression instills fear and can turn even a tiny ...

The American Staffordshire Terrier's temperament can be concerning. Even well-socialized AmStaffs can get quite aggressive. They are not friendly with other dogs, so never leave them alone together.

Fighting dogs were revealed as the group with the highest levels of aggression. This group includes American Bulldog, American Bully, American Pit Bull Terrier, American Staffordshire Terrier ...