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Hey I can only go on personal experience, I saw the mother and she had no breathing problems. Looked healthy and paperwork that added up, the father was best of breed at crufts in 2017 (Roman king) and the breeder showed me all of the paperwork to support this, you get to a point where you have to take people at face value. I did my research and was satisfied that I was buying a responsibly bred puppy.
As the imminent owner of a English bulldog I would say do your homework. The bulldog breed council have a very good website listing all of the dogs and bitches with the relative health scores, another one to
Look for us the Dutch health test. Responsible Bulldog breeding has improved massively over past 10 years, a well bred bulldog should not present anymore problems than any other large dog.