Plop Goes the Weasel! (1953)

A hungry weasel sneaks into Foghorn Leghorn's barnyard, and rather than protect the baby chicks himself, Foghorn sees a chance to make his old rival, the farm dog, look incompetent. Willing to risk the chicks being snatched, Foghorn schemes to let the weasel roam so the dog takes the blame for failing his guarding duties.