In the UK, there’s still a small amount of “crude ash” in most cat/dog food - but I guess not as much as there used to be. They also used to use a lot more ground-up-bone and other fillers.

It’s not necessarily a hatred of animals, it’s just the manufacturers perhaps love money a bit more than they “love” animals, and filling the food with ash and dust and stuff is cheaper.

I think I remember seeing white dog poo in the 80s/90s. It was easier to spot and avoid when walking down a dark ginnel.