According to the dog bite laws of Arizona, special precautions are to be followed by an owner of a knowingly aggressive dog. An aggressive dog is defined as any dog that has bitten a person or domestic animal without provocation or that has a known history of attacking persons or domestic animals without provocation. According to Michigan State University College of Law, provocation is determined by whether a reasonable person would expect that the conduct or circumstances would be likely to provoke a dog.
Behavior that should be deemed aggressive includes growling, snarling, curling lips, barking aggressively, and biting. If any of these warning signs are displayed, an owner is responsible for taking extra steps to ensure that their dog is controlled at all times and does not pose a threat to the safety of others.
An owner of an aggressive dog is required to take additional, reasonable care to ensure that their dog is unable to escape from the outside of their home, yard, or any enclosure. Reasonable care refers to the level of care that an ordinary person would exercise in the same or similar situations. Dog owners are also required to control their pet so that he or she is unable to attack a person or domestic animal when outside of their property.
Exceptions to these requirements include attacks by police or military dogs that are owned by governmental agencies, service animals, dogs that are lawfully involved in acts of hunting, farming, ranching, and other agricultural purposes, and dogs that are proven to had been provoked by the injured person.