Wirehaired Terrier is mostly a description of a coat. It's a common alternate name for the Wire Fox Terrier, the English fox-bolting terrier made famous by Asta in The Thin Man and Snowy in Tintin, but listings also use it for wire-coated terrier mixes with Jack Russell, Border, Cairn or Schnauzer in the family tree.
Most weigh roughly 13 to 25 pounds and have a dense, crisp outer coat over a softer undercoat. They tend to be bold, friendly and alert, with classic terrier habits like digging, barking and chasing small animals. On tree-lined streets full of squirrels, a secure leash and fence matter. Because ancestry varies, each dog's size, energy and coat say more than the label.