2005 Arizona Revised Statutes - Revised Statutes §13-1208 Assault; vicious animals; classification; exception
A. A person who owns a dog that the owner knows or has reason to know has a propensity to attack, to cause injury or to otherwise endanger the safety of human beings without provocation or that has been found to be a vicious animal by a court of competent jurisdiction and that bites, inflicts physical injury on or attacks a human being while at large is guilty of a class 1 misdemeanor.
B. A person who owns a dog that the owner knows or has reason to know has a propensity to attack, to cause injury or to otherwise endanger the safety of human beings without provocation or that has been found to be a vicious animal and who keeps the dog or vicious animal in an enclosed area or yard outside of a residence or structure on the property shall post a notice indicating the presence of the dog or vicious animal.
C. This section does not apply to dogs that are owned or used by a law enforcement agency and that are used in the performance of police work.