 Following the First World War , it surged in popularity and was associated with Hollywood stars and members of the British Royal Family . Its numbers have dropped significantly since then , with the breed listed as a Vulnerable Native Breed by the Kennel Club ; an all time low was recorded in 2008 when only 43 puppies were registered in the United Kingdom . This decline has been blamed on an influx of foreign and designer breeds , and the Sealyham 's reduced usefulness as a working dog . 
