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Hello. Thanks for the question.
It sounds like he has a painful back or neck. This is commonly caused by a bulging disc or disc herniation in the back. The common signs we see with these dogs are: pain, yelping when picking up, difficulty with stairs and reluctance to jump up. In severe cases, we can see paralysis of the rear legs. It doesn't sound like your dog is anywhere near the paralysis type.
The dogs that are just painful will typically do well with an anti-inflammatory med (Rimadyl) and something for pain (Gabapentin or Tramadol). These are meds that you would need to see a vet for and have prescribed. Medication, along with exercise restriction for 1-2 weeks, should get him back to normal relatively quickly.
I hope this helps, let me know if you have any other questions.