The Sealyham Terrier is a rare Welsh breed of small to medium-sized terrier that originated in Wales as a working dog. Other names of the breed include Welsh Border Terrier and Cowley Terrier. They have a white double coat which requires regular brushing with a wire comb in order to prevent matting. They make great companions, and the way they bond with their owners is almost magical. They'll do anything to please you. Check out our collection of Sealyham Terrier dog names for male or female puppies.