A Sealyham is featured in Maurice Sendak’s book Higglety Pigglety Pop!
In the film The Birds, Alfred Hitchcock made his cameo appearance walking his own two Sealyhams. One of his Sealyhams also appears in his film Suspicion.
Famous owners include Humphrey Bogart, Jean Harlow, Cary Grant, Elizabeth Taylor, Bette Davis, Agatha Christie, King George V, and Princess Margaret.