From The Collaborative International Dictionary of English v.0.48 [gcide]:
Longtail \Long"tail`\, n.
An animal, particularly a log, having an uncut tail. Cf.
Curtail. Dog.
[1913 Webster]
Note: A longtail was a gentleman's dog, or the dog of one
qualified to bunt, other dogs being required to have
their tails cut.
[1913 Webster]
Cut and longtail, all, gentlefolks and others, as they
might come. --Shak.
[1913 Webster]