Oregon Revised Statutes Animals § 609.161

(1) The dog is found chasing livestock not the property of the owner of the dog in an area where freshly damaged livestock are found;

(2) The dog is found feeding upon a warm carcass of a livestock animal;

(3) An examination of the dog's feces indicates ingestion of portions of the anatomy or covering of the anatomy of livestock by the dog; or

(4) Portions of the anatomy or covering of the anatomy of livestock are found on the teeth of the dog, unless the dog is regularly used for the purpose of herding sheep.