Oregon Revised Statutes Animals § 609.155

(3)(a) After the completion of tests administered pursuant to subsection (2) of this section and allowing an opportunity for a hearing under ORS 609.158, the county shall determine whether the dog has been engaged in killing, wounding, injuring or chasing livestock. If the county determines that the dog has been so engaged, the county shall take action as provided under ORS 609.162 and 609.163. In addition to any action taken under ORS 609.162 and 609.163, the county may require that the dog owner pay the costs of keeping and testing the dog during impoundment. If the county determines that the dog has not been engaged in killing, wounding, injuring or chasing livestock, the dog shall be released to its owner and, if the dog had been impounded upon receipt of evidence from a complainant, the complainant shall pay the costs of keeping and testing the dog during the impoundment.

(b) Notwithstanding ORS 609.090, a dog impounded pursuant to subsection (1) of this section shall not be released until a determination is made by the county pursuant to this subsection.