Bulldogs are as British as the Queen—but inbreeding is destroying them
Popular breed dogs are so lacking in genetic diversity that efforts to improve the breed from existing genetic stock might be fruitless, say scientists
English Bulldogs are a quintessentially British breed said to symbolise the country's tenacious spirit. But the dogs are so inbred that new blood may be the only way to return them to health, scientists warn.
Veterinary scientists from the University of California studied the DNA of 102 registered English bulldogs from across North America and Europe. They found 78 of the dogs were so inbred they were more closely related than "offspring of full-sibling parents from a random breeding village dog population."
English bulldogs can suffer from a range of serious health problems, including breathing difficulties, skin problems, cleft palates and difficulties conceiving and giving birth naturally. They remain highly popular in the UK and US, though, because of their childlike demeanor and appearance.
"Bulldogs that reproduce without assistance, move freely, walk or run for long distances, and breathe normally even at rest are the exception," the University of California's Niels Pedersen, Ashley Pooch and Hongwei Liu said in a report in the Canine Genetics and Epidemiology journal.
In the UK and US, these dogs can sell for well over US$1,000. An English Bulldog is also the official mascot of the US's University of Georgia.
"American breeders of English bulldogs have avoided the issue and even deny that the breed is unhealthy, pointing to its popularity as proof. However, the bulldog has been banned from plane travel in the cargo hold by many domestic and international airlines due to a high incidence of deaths," the report's authors said.