Mutts vs Purebred health issues?

Purebreds are generally healthy if they came from a responsible breeder and not a backyard breeder (BYB). A responsible breeder does genetic testing on their dogs and don't breed any dog that tests positive for known genetic problems. Buying an AKC registered dog proves that the dog is a purebred, but the AKC are not the breeder police. An AKC registered dog does not insure the health of the dog. As far as mutts go, they may be healthier or they may have those same defective genes in their blood. Your best bet is finding a responsible breeder. The AKC website has a link for locating breeders, but ultimately it will be up to you to ask the breeder whether they do genetic testing, to show you proof of their dogs bloodlines and a responsible breeder will want to know about you! A responsible breeder isn't in it for the money, by the time they do all this testing and proper vet care they are LUCKY if they make a profit. They do it for the love of the breed, and they care a great deal about the home of their puppies will go to.