Bars and Stripes Forever

Bars and Stripes Forever is a 1939 Merrie Melodies short directed by Ben Hardaway and Cal Dalton.

Plot
Shenanigans in (and out of!) prison. The prisoners are all dogs, and they resort to all means possible to attempt a prison breakout. When the dogs in prison make a break for it, the canine cops are on their heels. The prisoners are really in the doghouse with the warden when they attempt to escape from "Alcarazz," where "stone walls do not a prison make... but they sure help!"