You'd have to knock out almost every breed, tho. Small dogs like poodles, poms, doxies, etc have problems with their knees. Doxies have problems with their backs. Pugs, bulldogs, poms, poodles and others have problems with breathing and collapsed tracheas. large breeds have problems with hips and bloat. Cockers have problems with ears, eyes, skin, etc. There really isn't any breed that doesn't have a possibility of genetic problems. It's just one of those things, unfortunately.

If you think about it, humans are the same way. Trick knees, bad backs, allergies, bad eyesight, hearing loss, etc.