“The use of one blood-trailing dog controlled by leash during lawful hunting hours within 72 hours of shooting a big game animal, except bear and cougar, is allowed to track wounded big game and aid in recovery.”

State Regulations: https://app.leg.wa.gov/WAC/default.aspx?cite=220-413-060

United States:

Green — Tracking allowed
Red — No Tracking allowed
Gray — Tracking allowed under certain circumstances or in certain areas of the state/province, but not all