Strider was 4 months old, and overnight, could not even stand on his hind legs without screaming in pain. I took him to the emergency vet and they diagnosed HOD, and advised euthenasia. The vet was literally drawing up the syringe before I could open my mouth. We got out of there fast, and got a second opinion. The HOD was a total misdiagnosis, he actually had pano. We did the Rimadyl for three months, I switched him to a high quality adult food and the new (and current) vet put him on Cosequin, a glucosamine chondroitin suppliment. Within a day he was gingerly on his feet, and within a week he was normal. He is now 11 months old and has shown no symptoms since.
I don't know which of the changes to attribute the miraculous turn around, or if it was the combination of the three. I do believe that the change in food and the Cosequin are responsible for his continued lack of symptoms.
Keep the faith, there is hope and the only good thing about pano is that 90% of the time they outgrow it.
Stella