The Fox Terrier is one of the very oldest terrier breeds. Like other terriers, the Fox Terrier was developed as a hunter, in this case of fox (and rats) in England in the 18th and 19th centuries. The dog's job wasn't actually to attack the fox, however. Instead, its goal was to "bolt" a fox from its den or hiding place by barking and lunging at it until it finally fled. As such, this breed had to be small enough to get into a fox's hole, but long-legged enough to keep up with fox hounds.