Here’s one of the two cartoon adaptations of Milt Gross’ Count Screwloose. It isn’t a very good translation of the feel and charm of the comic strip, but it is fun and very well animated. The loony bin is nowhere to be seen. Why they decided to change Iggy’s name to J.R. the Wonder Dog I have no idea… and they stole his funny hat! You can see the other Count Screwloose cartoon, Wanted: No Master (also from 1939), here.
Note that this cartoon contains offensive racial depictions, and if this sort of thing offends you deeply you may not want to watch it.
Read more about this cartoon on the Big Cartoon Database.