Oregon Revised Statutes Animals § 609.170

In a county with a dog control program the owner of any livestock killed, wounded, chased or injured by any dog may, within 10 days after the killing, wounding, chasing or injuring occurred, or became known to the owner, present to the dog control board or county governing body a verified statement containing a full account of the incident, stating in detail the amount of damage claimed on account thereof, and the name and address of the owner or keeper of the dog, if known. The claim shall be supported by the affidavit of at least one disinterested person as to all material facts contained in it.