Feisty & energetic, Terrier is a highly intelligent and trainable breed. Their ancestors were bred as hunters and thus it has continued in their genes, as most Terriers continue to exhibit little tolerance for other dogs and animals and project themselves as eager for a spirited argument. They come in various sizes, from fairly small to the grand Airedale, and coats. Those with wiry coats require special grooming or stripping to maintain their distinctive terrier personality or characteristic appearance. Tough, energetic, and independent, Terriers are territorial and know how to protect their patch of earth and will bark nonstop at anyone that tries to approach their property.