The term "walking the dog" isn't what it seems. For most people, they would take their four-legged lovable doggie out for a stroll. In this case, "walking the dog" means to go home at lunch and masturbate until you howl louder than your dog. Most common tools used for this action: Hilighter, Hair brush, Dildo, Rubber fist, Shock collar & Colt's swag... fingers are not too common.
Bob: Hey, Fred, where you off to?
Fred: Off walking the dog...
Bob: Ohh, walk the dog, eh? Funny how I see you don't leave your apartment! Who's walking who??