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Hello. Thanks for the question.
It sounds like he may have hurt his back or neck. The most common cause of that in dogs, is a ruptured or bulging disc in the back. This can happen during normal daily activity in dogs.
The treatment is typically with anti-inflammatory meds (Rimadyl) + something for nerve pain (Gabapentin). I also keep these guys exercise restricted for a good 1-2 weeks. Most will have a full recovery.
You can have your vet do a neuro exam to determine if that is the case and then prescribe meds as needed.
I hope this helps, let me know if you have any other questions.