猫狗混战 Doggone Cats (1947)

Wellington the dog is given a package to deliver to Uncle Louie, with strict instructions not to let go of it. Sylvester and another cat that Wellington has been tormenting see this as their chance to get even. Besides repeatedly filching the package, at one point they drop a duplicate off a bridge. Wellington still manages to retrieve the package a few times, but never for long.