Green’s Dictionary of Slang

(UK Und.) a (little, yelping) dog.

1612		Dekker Canting Song O per se O O3: To thy Buhar [...] I bid adieu.
1648		Dekker Eng. Villainies (9th edn).
1665		Head Eng. Rogue I 47: Bughar, A Cur.
a.1674		‘A Wenches complaint for . . . her lusty Rogue’ Head Canting Academy (1674) 17: To thy Bughar and thy skew, / Filch and Jybes I bid adieu.
1688		R. Holme Academy of Armory Ch. iii item 68c: Canting Terms used by Beggars, Vagabonds, Cheaters, Cripples and Bedlams. [...] Bugher, a Cur Dog.
c.1698		B.E. Dict. Canting Crew.
1707		J. Shirley Triumph of Wit 200: To thy Bugher and thy Skew, / Filch and Gybes, I bid adieu [To thy Dog an Dish adieu, Thy Staff and pass I ne’er must view].
1725		New Canting Dict.
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict.
1754		Scoundrel’s Dict. 16: A Dog – Bugher.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.