
I feel so sad for you. I had to make the same decision with the same disease with my old girl back in April. I felt just the same, was I right, should I have done something else, was it too soon. But seeing her so flat, and so obviously very ill, and, like your boy, so tired. I couldn't let it go on. I planned in as much as I saw her at the vets in the morning, having been on a drip for 24 hours, and having had a discussion with my vet, decided she should come home and be PTS at home that evening. I sat with my head in my hands and tears literally splashing on to the floor. It is just the most awful thing, BUT I think planning is very important at such a time, maybe more so than any other. It is just so important to get it right, for you and for him.
It has taken me a long time to trust that my judgement was right, and there are times when I still question it. It is such a responsibility for us, and a big weight to bear. I am sure though that they would both have said that it was too hard to go on, so we simply let them rest. In doing so we pass the greatest test, that of unselfishness and love.
May he be bathed in golden sunshine at the Bridge, and may you be in peace with your decision, it was, without a doubt, right.