"Mouse-Placed Kitten" (1959) offers that old Warner Bros. Merrie Melodies standby of the wrong baby being delivered to a pair of expectant parents (see "Baby Bottleneck," "A Mouse Divided," "Goo Goo Goliath"). There's no stork involved in this one, though, as we see a kitten tied up in a bag and thrown out of a car, only to land at the doorstep of a mouse couple living in a barn. After scenes of the mouse father carrying the huge kitten and trying to rock it to sleep and then trying to feed it cheese (which the kitten rejects), the mice agree that the best thing for the kitten is to place him on the porch of the nearby farmhouse and hope that the human family there will take him in. A woman does and a year goes by and the mouse couple decide to go visit "Junior" at the house. Junior, under pressure from the lady of the house to keep the place mouse-free, goes after the mice and grabs them, but then recognizes them as his Ma and Pa and greets them heartily. He endeavors to hide them and take care of them during their visit. When Pa Mouse falls into a jug of "hard cider" and gets drunk, it's all Junior can do to keep him out of view and away from the vacuum cleaner being operated by the lady of the house.
It's a cute idea and features some great voice work by June Foray (as both the lady of the house and the mother mouse), but it's never fully developed, nor is it ever particularly funny. The previous cartoons I've seen with this theme did it better.