Arizona Revised Statutes Section 11-1020 and 11-1025 impose strict liability for dog bites. The owner is liable even if the owner may have done everything possible to keep the dog from biting someone. Likewise, the statute imposes strict liability regardless of whether the dog has ever displayed vicious tendencies. In Arizona, a dog is not entitled to one free bite. There is strict liability for the first incident. ARS Section 11-1025 states:
The owner of a dog, which bites a person, is in or on a public place or lawfully in or on a private place, including the property of the owner of the dog, is liable for the damages suffered by the person bitten, regardless of the former viciousness of the dog or the owner’s knowledge of its viciousness.
Proof of provocation of the attack by the person injured shall be a defense to the action for damages. (See ARS Section 11-1027)
The statute of limitations within which to file suit in a "strict liability" claim under the above-referenced statute is one-year from the date of the attack. A claim under the common law theory of negligence is subject to a two-year statute of limitations.