Terrier is a type of dog, not a single breed. The label covers about 30 recognized breeds, many developed over several centuries to hunt vermin, along with the terrier-like mixes that fill so many adoption listings. Most are small to medium, with wiry or smooth coats and a lively, confident outlook.
Expect a dog with opinions. Many terriers are loyal, affectionate and quick to learn, but barking, digging and chasing small animals are common habits. In Santa Barbara, that means a secure leash on the sidewalk and a yard or balcony that a determined digger can't get out of. Mixed-ancestry terriers vary a lot, so judge each dog by how it actually behaves, not by the label alone.