Have you ever noticed that while it’s pretty easy to tell your dog is sick, it’s much harder to know how your cat or bird are feeling? Well, before you start asking your dog why it can’t be more stoic like animals half its size, it’s probably worth considering each animal’s place in the food chain. You see, the lower down the food chain you are, the more important it is for you to hide any sign of illness. Obvious illness or pain function as red flags for predators. You may as well wear a sign saying, “Easy meal, guys. Come and get me.”