I'm sorry you're going through this, Susan Mary. Only you can tell how he's doing--if he's still enjoying life, doing favorite things. Does he still eat and drink normally? Want to play?
Just keep in mind that if you make the decision with love and with Max's best interests in mind, you can't go wrong, no matter what the decision is. You can only do the best you can and it will be fine.
You might want to sit down with your vet and have heart-to-heart with her. She might be able to help make your decision.
for you and Max!