Green’s Dictionary of Slang

jugelow n.

[Rom. guggal, a dog; note market traders’ jargon juck, juckle, a dog]

(UK Und.) a dog.

1812		Vaux Vocab. of the Flash Lang.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1828		Farrier & Naturalist 90: Jugelow. A dog.