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Hello and thank you for your question. I am a Veterinary Nurse with over 15 years experience and I have assisted in the care of many pets with this particular medical concern. It would be my pleasure to assist you today. Is it possible for me to obtain some additional information from you about your companion?
1) When was part of the limb lost? 2) Are you able to attach pictures of the area? 3) Can you also share video of the spasms you're seeing? 4) When did they start? 5) Is he able to walk?
There is no time constraint. I can wait for video when he's no longer in a corner.
Groaning can be a sign of pain, as can the twitching. Sometimes the loss of a limb can cause deeply seated phantom pains, so if this continues I would recommend having him examined. As well, at 12 years of age, he may have arthritis and a physical exam being performed as well as x-rays can determine if there is where his pain is coming from. If you wish to start him on some preventive therapy, there is glucosamine available for cats, as well. available here: http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=3571Another thing to mention is that there are no OTC pain medications that are safe for cats, so please avoid giving anything from home to Parker. This can cause life-threatening liver and kidney problems.
Happy to help. Good luck!
Good plan! Let me know if you need any more assistance.