Also, canids and felines, while including dogs and cats, are not exlusively dogs and cats. This is a very simplistic outlook on them. For example, foxes act much more like cats than dogs, and lions actually act pretty similar to dholes. There is no competition between "cats" and "dogs" in a zoo game, and as a person that worked in a zoo for many years, I can tell you that lions are extremely tough to feed and maintain, and this is realistically reflected in the game, while wolves and african wild dogs require much more enrichment, but are way cheaper when it comes to food costs.