Hollywood has known it for years—movies about dogs are guaranteed moneymakers. Be sure to pick up any of these straight-to-DVD cash cows at your local grocery-store checkout line or MovieTrough™:

Sea Bud: A dog competes with a dolphin to win the friendship of a man. The man then betrays them both by becoming best friends with his own wife.

Boxers Can Be Choosers: Twin dogs separated at birth try to reunite their owners by running around and barking at everything.

Woof War Three: When dogs from all different countries converge at the same dog park, the barks are so loud they could be considered nuclear.

The Dog Hangover: Three dogs can't remember what happened last night or any night ever. Now they're on an adventure to find their missing friend or anything else.

Cool Rottweiler: A dog wears a Hawaiian shirt to prep school.