Very few people feed dog food to Sealyham Terriers as the breed is now rarer than the Siberian tiger.
The Kennel Club placed the breed on its Vulnerable Breed List in 2007 after figures showed their numbers had almost halved between 1996 and 2005.
One woman who has a Sealyham Terrier is Tracy Titchmarsh, who spoke to the Coventry Telegraph about the breed.
She is quoted as saying: "Demand for them is incredibly high. I waited two years for Cooper. But even though they are incredibly rare they aren’t an expensive breed.
"Cooper is a dream. He's just such an easy dog to look after. Even at dog club he says hello to the other dogs and just relaxes."
Ms Tichmarsh explained that Sealyham Terriers cost between £700 and £800.
The news provider added that because of the reduced gene pool, some breeders have had frozen Sealyham sperm sent over from the US to make sure future puppies are healthy.
Sealyham Terriers originally come from Wales. The breed was officially recognised in 1910.