I don't know if you have ever bred dogs, but i showed and bred bloodhounds for almost 20 years till i retired a few years ago. Hip displasure has very little to do with spaying or neutering. It has a lot to do with inheritence. That is why every single dog i bred was x-rayed for hips , elbows, and patellas, The x-rays were submitted to the O.F.A (orthopedic foundation for animals). I also had hearts cleared by a board certified cardiac Vet. Most reputable breeders have this done. There are many breeds that have allergies, and the biggest allergy is to beef, so none of my dogs ate any foods with beef. I fed lamb, duck, or chicken based foods. I know many bulldog breeders, one of the largest bulldog clubs is located here on long island. The biggest problem with breeding this dog, is the fact that without help you can lose many of the pups because of the size of the heads, also umbilical hernias are common, because the mother will pull the cord when she releases the pup from the after birth. That is why most breeders choose to have a c-section done to make sure all pups survive. I love bulldogs, butto breed them properly is a lot of effort and expense. That is why the bulldog pups go for 1500-2000 dollars. It takes a lot of love and dedication to a breed to make sure this noble and historic breed stays around.