The Welsh Terrier looks more likely of a small Airedale Terrier. It is a British breed, originated from Wales and existed since the last century. It was better known as "Old English Terrier" or "Black and Tan Haired Terrier" in the 1900's. These breeds have been recognized since 1886 and are more common than the Airedale Terrier or the Fox Terrier.
These breeds can usually grow up to 38 cm with a weight of 9-10 kg. They are affectionate, happy and volatile, and usually the shy-type. They are more mild-mannered and calm than many terriers but are still playful and can be mischievous to provide plenty of entertainment and challenges.