Whippet, Snapdog definitions

Snap-dog, sb. a dog employed by poachers in driving game.
" They perceived some nets by the side of the plantation; three men were near them, and two others -with a snap dog in the field, driving the game" (near Walton).—Leicester Advertiser, April 18, 1874.

WHIPPET. sb. A breed of dog of the lurcher kind.

A Glossary of Dialect & Archaic Words Used in the County of Gloucester By John Drummond Robertson, Henry Haughton Reynolds Moreton Published by Pub. for the English dialect society by K. Paul Trench, Trübner & co., 1890. (Snap-dog & Whippet)

Leicestershire Words, Phrases, and ProverbsBy Arthur Benoni Evans, Sebastian EvansPublished by Pub. for the English dialect society by Trübner & co., 1881 (Snap-dog)