I don't think you'll find free animal models of the quality you want. (Able to tell what breed they are.) It's difficult to make models that realistic. Not very many people do it, and when they do, they generally don't give away their work. There are free animal models at 3dCafe. They aren't posable. Most of them aren't too realistic, and many of them are untextured. But perhaps you could morph and texture them yourself into what you want.