Is this one of the world's unhealthiest types of dog? Scientists in the US say English Bulldogs are so inbred they will die out if the gene pool isn't expanded. The dogs are said to suffer from health issues such as breathing difficulties and skin allergies, because of its distinctive features. Breeders argue the pedigree has evolved over centuries and that UK Kennel Club standards for the breed were revised in 2009 to ensure that they were 'fit for their original function.' | BBC Breakfast