Portabella, but is leg amputation an option? I know from many examples, that even older cats can do well with only three legs left. My mom has such a cat. I would suggest you try to see an orthopaedic surgery specialist, if one is availible in your area.

There is one thing to remember. Every living thing has to leave this world at some point. We all have limited time here. I feel that not the duration of this time spent here, but the quality of it is what matters. Well, I am sure Puss Puss had the best poissible life with you. I am sure she is thankful, and that she was gicing the good time back to you and your son. Try to talk to your vet, discuss the possible options, see the specialist.

I wish you and Puss Puss a good luck.