These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Moral Event Horizon: In-story, Missus claims that biting a human is always this for a dog. She is perfectly willing to bite Cruella or the Badduns, but she justifies that on the grounds that they aren't really human (and in Cruella's case, at least, she may be right, as the book and a deleted song take the liberty to imply that her last name might just be meant literally....)
Tribute to Fido: Dodie Smith's inspiration for the book was her own dalmatian Pongo; naturally, she put him into it as the main character.