French bulldog became the nation's most prevalent purebred dog last year
Of 716,500 puppies and other dogs registered last year, about 1 in 7 of them was a Frenchie
The breed removed Labrador retrievers from the top spot after a record 31 years
The French bulldog did not even feature in top 75 till a quarter-century ago
There's debate whether dogs prone to breathing, spinal, eye, and skin conditions should be promoted
UK urges people not to buy flat-faced breeds. Netherlands is mulling outlawing very short-snouted dogs