Boston Terriers are typically small, compactly built, well proportioned dogs with erect ears, short tails and a short muzzle that should be free of wrinkles. They usually have a square face. Frequently, variations on the standard are seen depending on the ancestry of the individual dog. At various times, the Bulldog, American Pit Bull Terrier, English Mastiff, Staffordshire Bull Terrier, and French Bulldog— among other breeds— have been crossbred with Boston Terrier lines to minimize inbreeding in a small gene pool.
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