Fell terrier is the old name for the long-legged working terriers of northern England's hill country, where shepherds needed dogs that could follow foxes into rock crevices. The Patterdale, named for a Lake District village, is the best-known strain, and listings often use both names for the same small, narrow-chested black, red or chocolate terrier, in smooth, broken or rough coats.
Bred for gameness rather than looks, many Patterdales keep a strong prey drive, high energy and a stubborn streak. In Dayton, where squirrels and other wildlife turn up in parks and yards, that shapes how you fence and leash. With exercise, reward-based training and patience, many become affectionate, funny companions for experienced, active owners. Dogs vary with genetics and upbringing.