Unlike most other terriers, the sealyham terrier was created by one man, namely John Tucker Edwards from Sealy Ham. When he retired in 1848, he spent all of his free time hunting. He lived in a rocky area inhabited by badgers, otters and wildcats, and none of the existant terrier breeds were tough enough for him. It's not known for certain what breeds he used to create the sealyham terrier, but there are many theories. He wanted short-legged wire-haired white dogs, and those that did not live up to his expectations were killed at once.
Today the sealyham terrier is a lot calmer and friendlier than it once was, but it's said to still be capable of attacking a bagder, which is quite interesting consider that it has been bred as a pet only for the last hundred years.
The sealyham terrier should have a rather broad head with long, powerful jaws. When viewed in profile, the head should appear rectangular. The ears are of medium size, with rounded tips and carried close to the head. The neck is rather long and thick, with a deep chest reaching down between the frontlegs and straight back. Straight frontlegs, with noticable powerful hind legs and a good amount of angulation. The tail is carried high. The coat is long, hard and wirey.