In the small, old-fashioned community of Old Town, the Goodman family and their innocent and dimwitted 6-year-old son Tommy have a satanic border collie dog named Mr. Pickles. The two spend their days romping around Old Town, while unknown to Tommy, the family or anyone Mr. Pickles tolerates – except for Tommy's grandfather – Mr. Pickles secretly slips away to kill and mutilate his countless victims. Mr. Pickles will often reassemble and resurrect his victims which then reside in his underground lair and do his bidding. Through his evil, murderous rampage against those that threaten his boy, get in his way or annoy him, Mr. Pickles brings some order to Old Town, which is otherwise riddled with crime in the face of the dimwitted sheriff.