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The dog, named Boniface, is learning how to scuba dive.
Owner Sergei Gorbunov, a professional diver in the Pacific Coast city of Vladivostok, had a diving suit complete with helmet made for the dog and is teaching him the tricks of the trade.
In a recent demonstration, Boniface barked eagerly as Gorbunov readied the equipment and uncomplainingly endured being hung upside-down as Gorbunov fitted the suit on him.
Once underwater, he seemed to have a different outlook, emitting some high-pitched whines.
Gobunov says, "Underwater, I don't think he experiences any stress."