In my tech experience, we never had a dog that would allow his rear legs to be tied up and stretched back for the OFA-style hip shots. I like PennHip better for breeding stock. If you cannot (or can, but with great difficulty) make him lay flat on his back while his legs are tied and stretched back at your house with the people he knows and trusts, you won't be able to do it without sedation at the vet's. It's stressful, and many dogs are very sore for the next few days because of how the legs are stretched. Get his shots, but I'd hold off on hip x-rays until breeding age at 2 years old, IMO.