No Symptoms but Trouble on the Horizon I was reading a book the other day about hip dysplasia in dogs. Before going further, I should add that this applies to cats as well. The article was written by a veterinarian and it had something very important to say about this painful condition. An incredible 65-70% of young puppies display hip dysplasia when screened with an X-ray. That includes young pups that are not demonstrating symptoms; with no lameness or other symptoms of pain that would be.