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Hi. My name is***** I'm sorry to hear about this incident with Bigfoot. How long ago did the fight happen? Is it just the one rear leg that he's not using? Is he dragging it?
Ok. This is a situation where the unknown is if that leg has a fracture / dislocation or is it just a soft tissue injury. It is better that there are no obvious outward wounds / bleeding. Unfortunately, the only way to know if there is a fracture / dislocation for an owner at home is if there is a very obvious bending where a bend shouldn't be. At home, the only thing an owner can really do there is to get him in a quiet area where he can rest and not be further stressed. There are no safe OTC pain medications for cats. Don't give anything to help with discomfort. Could he start to progressively use this leg with that course of action? There is no way to know. If it is discomfort from a soft tissue injury, it may start to get better with time. 20 minutes out is very recent. Ideally, a veterinary exam and x-rays would be done to look for fractures or dislocations. If they are present, then treatment options for those are set up. If it is soft tissue, they may just do rest, time and pain management.
Giving her some time to rest is what some owners will do to see if things improve with that. If she's not overtly painful and distressed, giving her some time may not be a bad option.
I'm hoping for the best for this older guy!