Your dog is a beautiful old guy. I've been through a few. I love the big dog. On my third Golden R. Here are a couple of photos of my first, when he was younger, and then about two months before we put him down. Soo many tumors, all of his legs were going out, had to lay down after he came to me. It was soo hard to do, but had to be done.
Here he is older.
This is just a couple of months before I just couldn't let him be in the pain he was in any
longer. He was laying down soon after this photo was taken. Just couldn't stand.
Had him cremated, in a beautiful box with his name on it. Hard to lose a pet you've had
for so long.