Utah Code § 10-8-65

(1) Subject to Section 18-2-101, a municipality may: (a) license, tax, regulate, or prohibit the keeping of dogs; and (b) authorize the destruction, sale, or other disposal of a dog if the dog is at large contrary to ordinance. (2) (a) As used in this Subsection (2): (i) "Retired service animal" means a dog that: (A) at one time was a service animal for the current owner; and (B) no longer provides service animal services for the owner because of the dog's age or other factors limiting the dog's service capability. (ii) "Service animal" means a dog that: (A) is used by a law enforcement agency; (B) is specially trained or is in training for law enforcement work; and (C) assists a law enforcement agency in the performance of law enforcement duties. (b) If a municipality adopts a limit as to the number of dogs a person may keep, the municipality shall allow a person to keep a service animal, a retired service animal, or both in addition to that limit.