PDFWAC 260-80-150
Mistreatment of horses.
No person may subject any horse to any form of cruelty, mistreatment, neglect, abuse, abandonment, injury, maiming or killing or administer any noxious substance to or deprive any horse of necessary care or sustenance, shelter or veterinary care. This section does not apply to treatment or euthanasia of a horse by a licensed veterinarian consistent with standard veterinary practices.