That sucks Bill...really sorry to hear it
Had to do what was right for my dog several years ago...one of the hardest decisions I'd ever had to make. But, he reached up and licked my face as the vet gave him that last shot. I like to think he was thanking me for all the good years...and for doing what was right for him.
Went out a week later...found another lil fuzzball and started over. Einstein was never intended to 'replace' Boomer...but he did help fill the void that was left.
Hang in there man...remember all the good times...