The breed has also been called the Waterside Terrier , because it was bred originally to hunt otters in and around the valleys of the River Aire which runs through Airedale . Bred from a Welsh Terrier and an Otter Hound , the breed has also been called the Waterside Terrier , because it was bred originally to hunt otters in and around the valleys of the River Aire which runs through Airedale .