Okla. Admin. Code § 310:599-3-2
It shall be the duty of the veterinarian in whose supervision the dog, cat, or ferret is placed to keep the animal isolated and secured in a separate cage or kennel and under observation for any symptoms of rabies. The veterinarian shall report immediately to the Department designee any changes occurring in the condition of the dog, cat, or ferret. In the event the animal being observed dies, or develops rabies-like symptoms within the specified period of confinement, the head of the animal shall be removed immediately to preserve the brain, including brainstem, for rabies testing and packed in a shipping container in accordance with instructions published on the rabies laboratory form and submitted to the Oklahoma State Department of Health designated rabies testing facility.
Okla. Admin. Code § 310:599-3-2