 During the 1920s and 1930s , Sir Jocelyn Lucas used the dogs to hunt badgers which he usually relocated . At this time he also used Sealyham Terriers for hunting otters , stoats and squirrels . Deciding that he wanted a better hunting dog than the Sealyhams , bred for conformation showing , he cross @-@ bred the dogs with the Norfolk Terrier . This resulted in an unrecognised breed of dog he called the Lucas Terrier , which he described as " death to rats and rabbits " . 
