Oregon Revised Statutes Animals § 609.163

(1) If a county assesses a civil penalty under ORS 609.162 against a dog owner who has previously been assessed a civil penalty, fine or forfeiture based upon the killing, wounding, injuring or chasing of livestock in an incident not involving the same dog or dogs as in the matter being determined, the county shall assess an additional civil penalty of not less than $250 and not more than $1,000.

(2) If a county assesses a civil penalty under ORS 609.162 against a dog owner who has previously been assessed two or more civil penalties, fines or forfeitures, or a combination thereof, based upon the killing, wounding, injuring or chasing of livestock in two or more incidents not involving the same dog or dogs as in the matter being determined, the county shall assess an additional civil penalty of not less than $1,000 and not more than $5,000. A penalty under this subsection is in lieu of a civil penalty under subsection (1) of this section.

(3) In addition to any other civil penalty under this section or ORS 609.162, if a dog that kills, wounds, injures or chases livestock is not licensed as required, the county may assess a civil penalty of not more than $1,000. A civil penalty imposed under this subsection shall prevent imposition of a fine under ORS 609.990 for violation of ORS 609.100.