Okla. Admin. Code § 325:25-1-12
Any horse ineligible to be entered for a race or ineligible to start in any race which is entered or competes in such race, may be scratched or disqualified; and the Stewards may discipline any person responsible therefore. A horse must have attained January 1 of its two-year-old year to be eligible to enter or compete in a race.
Amended at 17 Ok Reg 2417, eff 6-26-00