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While I'm necessarily constrained by distance to determine the source of Curly's pain - and I believe you're correct in considering pain to be the cause of his agitation - such pain and biting of the hind feet suggests spinal cord compression and referred pain (think: sciatica) resulting from intervertebral disk disease - a "slipped disk". If I'm correct, it would be prudent to have Curly's vet attend to Curly at your earliest convenience. I hope you can get your email working. Most of us aren't allowed to communicate with customers by phone. I'll opt out in case another expert can communicate in that manner.
My name is***** and I would like to assist with your question today. I want to check in and see how things are going. Did you dog's symptoms resolve or did you end up seeing a vet? In addition to what was mentioned above, I am concerned about an issue with fleas or anal glands. I would like to discuss this further with you.