Lend a Paw(1941)

Pluto's jealousy of a kitten leaves him conflicted about rescuing it.

Jealous over Mickey's attention to a kitten, Pluto's devil-self argues with his angel-self over whether or not to rescue the kitten when it falls into a well. The angel-self wins, and Pluto is treated like a hero. In the end, he and the kitten become friends.