Every animal is always evolving, but we can not see it because it take many years. Only in a state of Hardy-Weinberg equilibrium, is when evolution does not occur. Animals are always are trying to be the most fit for their environment. Also the animal has no say in Natural Selection, the environment will chose the best animal for it's environment. Animals that are maladapted, or not suited for their immediate environment will die. Also an animal can be the best suited for it's environment, but if it can not reproduce there is no way those genes can be passed on to the next generation.