Most Hip dysplasia=being fixed to early. I've read countless veterinarian reports on this. Actually it effects all dogs such as German Shepards too with hip problems and arthritis. We've always owned frenchies and English bulldogs and never had issues. Yes your right don't breed the ones with issues but obviously your going to get that from puppy Mills. Dogs actually aren't supposed to eat most of the stuff you find in foods at pets stores it's all fillers and the protiens are not natural for dogs. It's really not even "allergies" but a reaction to the food. My dog eats rabbit, lamb, and duck and has no problems. Your just making excuses for issues caused by crappy food. It's like humans eating McDonald's daily and expect to have no issues. Labs, German Shepards, Goldens, pugs, and various other dogs are susceptible to cancers and other issues but people always seem to pick on bulldogs.