“The terrier has a most acute smell, is generally an attendant on every pack of hounds, and is very expert in forcing foxes or other game out of their coverts. It is the determined enemy of all the vermin kind; such as Weasels, Foumarts, Badgers, Rats, Mice, &c. It is fierce, keen and hardy; and, in its encounters with the Badger, sometimes meets with very severe treatment, which it sustains with great courage and fortitude. A well-trained veteran dog frequently proves more than a match for that hard-biting animal.
There are two kinds of Terriers, – the one rough, short-legged, long-backed, very strong. and most commonly black or yellowish color, mixed with white; the other is smooth, sleek, and more sprightly appearance: it is generally of reddish brown color, or black, with tanned legs; and it is similar to the rough Terrier in disposition and faculties, but inferior in size, strength, and hardiness.”
Excerpt from A General History of Quadrepeds – The Terrier – Published 1807 – Author Ralph Beilby