Utah Code § 18-1-3: Dogs attacking domestic animals, service animals, hoofed protected wildlife, or domestic fowls.

Any person may injure or kill a dog while:

(1) the dog is attacking, chasing, or worrying:

(a) a domestic animal having a commercial value;

(b) a service animal, as defined in Section 26B-6-801; or

(c) any species of hoofed protected wildlife;

(2) the dog is attacking domestic fowls; or

(3) the dog is being pursued for committing an act described in Subsection (1) or (2).