Most people can recognize when their dog is happy, but Otis, an RCMP chocolate Labrador retriever, doesn't leave anyone guessing. THE CANADIAN PRESS/RCMP-HO

ROCK CREEK - Most people can recognize when their dog is happy, but Otis, an RCMP chocolate Labrador retriever, doesn't leave anyone guessing.

Officers with the Mounties Road Safety Unit stopped a vehicle on Highway 33, about 30 kilometres east of Osoyoos, B.C., on Thursday morning.

Officers knew something wasn't right and that's when they brought in Otis, who sniffed out about a 1.5 kilograms of marijuana and several thousand dollars in cash.

Police used that discovery to get a search warrant for a home in Peachland, B.C., where they say they found a large marijuana grow operation, more cash and a power bypass.

Two men and a woman, all in their twenties, are under arrest.

A picture taken of Otis just after the bust shows the dog smiling, something that RCMP Cpl. Dan Moskaluk says makes him chuckle every time.