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Hi my name is***** and I am a licensed veterinarian. I hope I can help you and Keko.
Typically when I see patients with acute lameness of a rear limb I am concerned with orthopedic issues. Sometimes it can be a condition called patellar luxation where the knee cap does not stay in the groove of the knee and/or I see cranial cruciate ligament ruptures. Both of these conditions would need to be ruled out before a nerve issue could be diagnose. A physical exam with specific palpation of the knee by a trained veterinarian and radiographs of the knees might be indicated based on that exam.
I hope this helps and please let me know if you have further questions.
Conservative treatment would include strict rest and confinement-- no jumping, running etc and a non steroidal inflammatory. The most common OTC used medications are Aspirin and ibuprofen most often and one dose only. Usually 10mg/kg ibuprofen and up to 20mg/kg aspirin. More than one dose of either can cause GI ulcerations and serious complications. If clinical signs continue thereafter I recommend an exam with a veterinarian. Please let me know if I can help any further.