Trivia: One of the filmmakers suggested introducing a newborn baby in the story because he had just had a baby, and thought it was interesting to watch his own dog react to a new baby in the house.
Trivia: Although the spaghetti-eating sequence is now the best known scene, Walt Disney originally did not want it in the film as he thought it would not be romantic and that two dogs eating spaghetti would look ridiculous. Animator Frank Thomas was against Walt's decision and animated the entire scene himself without any lay-outs. Walt was so impressed with Thomas's work he decided to keep the scene in.