Actually, they're sensitive to many of the same things. It's just easier to get those things out of whack. We can't change the acid content of the air animal

Actually, they're sensitive to many of the same things. It's just easier to get those things out of whack. We can't change the acid content of the air animals are always in contact with, nor can we significantly change the chemical composition of that air. An ill-maintained fish tank will do those things - doesn't meant that a fish is more sensitive than a dog, only that the environment of the fish is much more sensitive than the environment of a dog.