Here’s a reference of one of my own dogs that shows what I mean with that “lazy S” shape, from as near a top as I could find that I had and from the side. Note that while it is near a pyramid shape when taken as a whole, it’s more like a stepped pyramid but with more rounded transitions. How sharp this transition is depends on the animal (cat, fox, dog, etc) and the breed (Chihuahua, shepherd, etc), but it is present. Bears have this too. Hoofed animals, like deer and horses, might have more of a straight from the top, but from the side, they still have it on the side view, though less distinct.
