Fox Terrier usually means the Smooth or the Wire, two closely related breeds developed in Britain to bolt foxes from their dens during mounted hunts. The mostly white coat kept them from being mistaken for the fox. The tiny Toy Fox Terrier is a separate breed, and terrier mixes are often labeled Fox Terriers too, so size, coat and energy can vary from dog to dog.
Expect a bold, quick, funny dog with a mind of its own. Strong prey drive means lizards, rabbits and cats can set off a chase, so a leash outside fences is a must. Smooths have a short coat that needs little more than a weekly brushing. Wires shed little but need regular clipping or hand-stripping, which affects grooming costs.