 Sealyhams measurements vary by breed standard according to particular countries . The Kennel Club breed standard states that the height of a Sealyham Terrier should not exceed 12 inches ( 30 cm ) , measured at the withers or at the top of the shoulder blade . The ideal weight for a Sealyham is 8 kilograms ( 18 lb ) for females , or 9 kilograms ( 20 lb ) for males . 
