In the late 1940s, by crossing his Sealyhams with Norfolk terriers he developed a breed of dog (which he described as "death to rats") and the Lucas Terrier was named after him.
In the late 1940s, through a cross between his Sealyhams and Norfolk terriers, he created a dog breed famous for its exceptional rat-hunting abilities, which was later dubbed the Lucas Terrier in recognition of his contributions.