sheep-biter

Etymology
+ . Figurative term possibly influenced by the fable "De cane oves domini sui occidente, a quo suspensus est" in Hecatomythium by (later included with Aesop's Fables as "A Sheep-Biter Hang'd" — see quotations).

Noun

 * 1)  A sheepdog that worries (chases or attacks) sheep.
 * 2)  A contemptible person, expecially one who practices petty thefts.
 * 1)  A contemptible person, expecially one who practices petty thefts.

Synonyms

 * See Thesaurus:git and Thesaurus:thief