If you loved Little Nemo: Adventures in Slumberland, try The Adventures of Milo and Otis
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
You already loved

Little Nemo: Adventures in Slumberland
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The Adventures of Milo and Otis
What they share
Both films are directed by Masanori Hata, and they both carry the cozy mood tag, and they sit in Adventure / Family territory. If that's the register that drew you to Little Nemo: Adventures in Slumberland, the second film will land in a comparable space — through a different lens.
cozy
What The Adventures of Milo and Otis is
Odd couple buddy flick shot entirely in Japan that believes animals are just people with fur. A runaway cat and dog endure a tourist brochure of natural disasters to find each other. Somewhere between wildlife documentary and yearbook photo caption.