Blue will have to be checked by his vet to see if he could withstand the surgery. All organs must be functioning properly. Perhaps his vet can determine that he is sound enough to still have the surgery. What breed is he? Some breeds live to the early twenties. I have two senior girls myself. Delilah will be 10 this year and Daisy is 8.

Does his vet think it's too late? I hope you can have him around for alot longer. Best wishes for him.