Ask a Dog Vet and Get Answers to Your Dog Health Questions
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.