The Collaborative International Dictionary of English v.0.48:
Bobtailed \Bob"tailed`\, a. Having the tail cut short, or naturally short; curtailed; as, a bobtailed horse or dog; a bobtailed coat. [1913 Webster]WordNet (r) 3.0 (2006):
bobtailed adj 1: having a short or shortened tail; "bobtail mare" [syn: bobtail, bobtailed]