The Patterdale Terrier is a sturdy, tough, active little terrier that presents a compact, balanced image. As a working terrier, it has to be capable of squeezing through very small passages underground to follow its quarry. The Patterdale’s chest should be capable of being spanned behind the shoulders by an average man’s hands with the fingers of both hands touching. This breed is worked far more than it is shown, and breeders are primarily concerned with the practicality of the breed. This terrier must have a strong neck, powerful jaws and teeth, the fortitude to hold its quarry at bay, and the ability to squeeze into tight burrows. He must have great flexibility and endurance.

The Patterdale is an extremely courageous working terrier, traditionally used to go to ground. Patterdales are extremely willing to work and have a high desire to please. They are very active and have a strong prey drive; and though they should be peaceful with humans, livestock and other dogs, they are not a dog for the average pet owner. They require an owner with a sense of humor and one that understands and can tolerate a real terrier temperament.