Welsh Terriers are active, cheerful dogs that are intelligent and affectionate. They bond very closely with their families although they can be somewhat reserved with strangers. They enjoy playing games and, as such, are ideal for children, able to tolerate horseplay. If introduced to cats and other household animals when young, they will accept them willingly. If not, they will have a tendency to chase them. They are happiest being the only dog in the household. They are brave dogs that will hold their own fearlessly, although they are not normally aggressive.
Some historians assert that these terriers are a direct link to the Old English Black and Tans, but there are lengthy Welsh Terrier pedigrees, which would imply that the breed is not a descendant of the now extinct English breed. In 1737, residents in the Carnarvonshire area of Wales were said to pride themselves on the purity of their Welsh Terriers. Indeed, the breed was known as the Carnarvonshire Welsh Terrier. For over two and a half centuries, this breed was used for the pack hunting of otters and badgers