In fact, small dog breeds tend to be some of the most ... Their coats come in four colors — black, black-and-reddish brown, red, and black and tan — and their coats can be smooth or rough.

Some breed registries—including the American Kennel Club—don't consider the black mouth cur a purebred dog. By definition, "cur" can refer to a "mongrel" dog or one that is comprised of ...