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Hello. Thanks for the question.
It sounds like your dog has a disc herniation in the back. This is a common cause of pain in small breed dogs. I typically treat with a combination of an anti-inflammatory (Rimadyl) + something for nerve pain (Gabapentin). I'll also have the dog exercise restricted for 1-2 weeks. Most dogs are improved within 2-3 days, and pretty much normal 5-7 days out.
I think the focus should go back to pain control vs the GI tract.
I hope this helps, let me know if you have any other questions