Bobtail \Bob"tail`\, n. [Bob + tail.] An animal (as a horse or dog) with a short tail.
Rag, tag, and bobtail, the rabble.
Source: Webster's Revised Unabridged Dictionary (1913)
Bobtail \Bob"tail`\, a. Bobtailed. ``Bobtail cur.'' --Marryat.