Fran, 
My deepest sympathy goes out to you our pups are family for sure.   
We have had 2 dogs, we still have 2 now. 5 years ago we had to put down a 9 year old due to cancer. Man oh man what a hard time both my wife and I had. We put her down on a Sunday, we were both distressed and wound up taking a sick day the following day.  To add insult to injury 2 years ago our youngest developed a disk disease the choices were not good since she could not walk  We opted for a very expensive operation and it worked. 
Take care