Terrier is a type of dog rather than one breed. The name comes from the Latin word for earth, because these dogs were developed over several centuries to hunt rats, foxes and other vermin, often by following them into burrows. Adoption listings use the label for small to medium dogs that look terrier-like, frequently mixes with Jack Russell, Rat, Cairn, Schnauzer or Chihuahua in their background.
Most weigh 10 to 35 pounds and have wiry or smooth coats. Many are affectionate and loyal with big personalities, and common habits include barking, digging and chasing small animals. In Janesville, a secure yard and a steady leash routine matter more than size. Because ancestry varies so much, a dog's size, coat and energy are best judged by meeting the dog and watching how it behaves.