boston bull,
boston terrier small pug-faced American terrier breed having a smooth brindle or black coat with white markings
schnauzer old German breed of sturdy black or greyish wire-haired terriers having a blunt muzzle ranging in size from fairly small to very large; used as ratters and guard dogs or police dogs
terrier -
A book or roll in which the lands of private persons or corporations are described by their site, boundaries, number of acres, etc. ; a terrar.
Wikipedia
A terrier is a dog of any one of many breeds or landraces of terrier type, which are typically small, wiry, very active and fearless dogs. Terrier breeds vary greatly in size from just a couple of pounds to weighing over 70 pounds and are usually categorized by size or function. There are five different groups with each group having several different breeds.