Terrier is a label for a group of dogs rather than one breed. The name comes from the Latin word for earth, since terriers were developed over several centuries to go after rats, foxes and other vermin, often underground. Shelters use the word for small to medium dogs that look terrier-like, including many mixes with Jack Russell, Rat, Cairn or Schnauzer in their background.
Expect a wiry or smooth coat, a lively and confident outlook, and a loyal streak. Barking, digging and chasing small animals are common habits, and some Terriers have an independent streak that rewards patient training. In Lewisburg, a securely fenced yard or steady leash walks help channel that energy. Size, coat and energy vary with ancestry, so meeting the dog tells you more than the label.