The Airedale Terrier is the largest of all the Terrier breeds. It inherits the playful demeanor and intelligence that define the Terrier family, but its size means that it will need a firm and experienced trainer. They love to hunt, willingly chasing any small animal that crosses their path. For this reason it is wise to keep them leashed or in a yard. They can be kept indoors effectively if exercised extensively and trained on a regular basis.