Source : Webster's Revised Unabridged Dictionary (1913)

Bobtailed \Bob"tailed`\, a.
   Having the tail cut short, or naturally short; curtailed; as,
   a bobtailed horse or dog; a bobtailed coat.

Source : WordNet®

bobtailed
     adj : having a short or shortened tail; "bobtail mare" [syn: {bobtail}]