Mail Dog
When a pilot has to turn back due to a severe storm, he drops the mail at a remote outpost where it can be delivered by dogsled. The falling mail pouch lands on Pluto, and he sets out to deliver it. He is continually delayed by a rabbit along the way, but in the end, the rabbit helps Pluto deliver the mail pouch.
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About
Mail Dog (1947) is a animation movie. Starring Pinto Colvig. Rated 6.2/10 on TMDB. Watch it online free on ZapFlix.