PDFWAC 260-40-155
The effect of wins on eligibility.
(1) For thoroughbreds, all wins at a Class C race meet in the state or a fair meet in the state of Oregon will not be considered in determining any eligibility at a Class A or B race meet, with the exceptions:
(a) Any horse which has won a race at a recognized race meet may not compete in a maiden race.
(b) Thoroughbreds running at a Class A or B race meet in a mixed breed race, all wins at any recognized meet will be considered in eligibility requirements.
(2) All wins at any recognized race meet will be considered in eligibility requirements of horses running at Class C race meets.
(3) For other breeds, all wins, including maiden wins, will count in eligibility at all race meets, if the win is recognized by the breed registry association listed in WAC 260-16-050(2).