honestly man. I have four and they are my life. I love my dogs very much and I have pitty on the poor shit that tries to do them harm. Now, two ways to look at things. 16years of your life times (x) 7 in dogs years, your dog is 112 years old. It is hard to make these decisions, especially when she is still jumping and romping around with you and playing and seeming as if she is having fun. Then is in pain afterwards? That pups only thing is to please her master. It's been that way for 16 years. I have seen dogs do amazing things. My friend is a trainer and I see some of the things and hear first hand accounts of some of the feats dog perform. Here is my take. No doubt, your dog is old. You have had her, her entire life. You know that dog better than your vet does. You should be able to see the pain if it is there. If your dog is blind and deaf, she is blind and deaf. Not in pain. Now if she is in pain, you of all people should be able to tell this and, as I hate to say it, need to be the one to make the decision at that point. Dont let love of the romping little bundle cloud your insight. Good luck either way. Its not a easy decision.