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Hello. I'm sorry to hear about your pitty.
It sounds like he may be painful. One of the most common signs of pain in dogs will be reluctance to move/ jump/ do stairs and trembling. The hiding is also not uncommon. This could be a slipped disc in the back or just a soft tissue muscle sprain/ strain in a limb. It can be hard to tell, even with a good neurologic and orthopedic exam.
Most of these guys will get put on a pain medication and rest for 1-2 weeks. The majority are doing much better within 2-3 days, and back to normal within 5-7 days. If you want to just try something at home first, you can give over the counter Aspirin. The dose in dogs is 5 mg per lb every 12-24 hours, as needed.
I hope this helps, let me know if you have any other questions.