As far as Pluto, I always just assumed that Mickey started wanting a pet, and kidnapped one of his dog neighbors, took him down to the basement, and "fixed" him. And nobody said anything later when Mickey took his naked, lobotomized neighbor, now on all fours and barking, and even stupid now for a real dog, out for a walk, and made him fetch, and let chipmunks humiliate him every day. Not a thing. Because, as Ellison once said, YOU DO NOT FUCK WITH THE MOUSE.
And if I wasn't certain Disney would sue me till there was nothing but a greasy spot, I'd have drawn this by now...