Terrier is a label for a group of dogs rather than a single breed. The name comes from the Latin word for earth, because these dogs were developed over several centuries to hunt rats and foxes by going into burrows. On adoption listings, the word usually means a small to medium mix with a wiry or smooth coat, often with Jack Russell, Rat, Cairn, Schnauzer or Chihuahua ancestry.
Most weigh 10 to 35 pounds, bond closely with their people and learn quickly, with a confident streak that can look like stubbornness. In Chandler, that digging instinct meets hard desert soil and block-wall backyards, so secure fencing matters. Size, coat and energy vary from dog to dog, so spending time with the dog tells you more than the label does.