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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
It sounds like he is pretty distressed with the hard abdomen, pacing and panting. Hopefully this is all due to pain from his herniated disc. Bloat is always a concern when there is dry heaving, though he's not the typical large breed that we usually see with bloat (aka twisted stomach).
To be on the safe side, I would get him looked at. X-rays of his chest/ abdomen will help to rule out anything too serious internally. If those are normal, then extra pain meds like Gabapentin or Tramadol or a sedative like Trazodone can help to get his signs under control.
I hope this helps, let me know if you have any other questions.