The change comes after voters in November legalized the possession of small amounts of pot.
The state patrol and some other police agencies in the state are taking the advice of the Washington Association of Prosecuting Attorneys to change the dogs' drug-sniffing standards.
KOMO-TV reports marijuana was removed from the police dog guidelines set by the state's Criminal Justice Training Commission.
The attorneys' association also told police that an "alert" from a drug-sniffing dog that had been trained to find marijuana is no longer enough evidence for a search warrant. Police will need other evidence, at least until the old dogs retire.