A terrier is a dog of any one of many breeds or landraces of the terrier type, which are typically small, wiry and fearless.. Terrier breeds vary greatly in size from just 1 kg (2 lb) to over 32 kg (70 lb) and are usually categorized by size or function. There are five different groups with each group having several different breeds.

This article uses material from the Wikipedia article "Terrier", which is released under the Creative Commons Attribution-Share-Alike License 3.0.