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Hi, I can help you with your question today. It sounds like you are describing a pretty small breed dog. Is he a little guy?
For a small guy with severe hip pain, I would be worried about a condition called Legg Perthes or avascular necrosis of the femoral head.
This disease is also a genetic issue (as is hip dysplasia), and dogs can be treated with surgery to stop the pain.
I highly recommend having him evaluated by your local vet. I would start with a physical exam and x-ray of his hips/pelvis. He will likely need sedation for his x-rays since he is so painful. This can give us our diagnosis so we can proceed with an appropriate treatment plan.
Unfortunately, Legg Perthes is really painful. I would not expect medication to be enough to control his discomfort.
You're absolutely right, I can't make any diagnosis over the computer. This is just my suspicion based on clinical experience and your description. I would simply start with the x-rays, if we confirm Legg Perthes, you can absolutely start pain medication. I just do not expect it to be enough to control the signs. I could certainly be wrong, I just want to let you know what I would expect. Of course, I don't make a penny if he ends up needing surgery, so I'm not suggesting it for my own gain!
Everyone is entitled to an opinion! Regardless, I do hope he feels better soon. I'm sure we can agree that's the priority.