I have seen hip dysplasia in a youngster. But the x-rays were definitely hip dysplasia and it wasn't a nothing yesterday and not holding weight on it today type of thing. It sounds like pano, age is right, more common in males, and it can cause fever, lack of appetite, lethargy, etc, or just a slight limp. If the x-rays did not look significant, then I would definitely look for something else. There is no rule saying it can't be pano on a dog that is slightly dysplastic. Slightly dysplastic usually doesn't have any symptoms at all. moderately dysplastic may not have any symptoms. So you want to know if it is the structure of the dog (dyplasia) or pano which should be evident as well with x-rays.
Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.