I can see how much harder it is for you when your dogs still have some good days. For me, I had taken my dog for a walk and shortly after I found her in extreme agony flopping on the floor without the use of her hind legs - she was a 15 year old German Shepard/Siberean Husky mix. It was obvious what needed to be done but it was late at night on a weekend and I had no stomach to do like in "Ole Yeller". I frantically was able to find a vet clinic that was opened 24 hours. I drove my dog there (in agony all the way) they gave me the reassurances that what I was doing was the only logical thing. I decided against being in the room when they euthanized her.