Sorry to hear this Strumpet, but like lizzieloo says, you'll know when it's time. Toby had a simular thing by the sounds of it. He went downhill very fast, wouldn't eat, drank loads, and was sick quite alot. Vet said he had kidney and heart failure. Everytime I so much as looked at him, I burst into tears. That couldn't have been nice for him, either. I tried to let him go on his own terms, and god love him he tried too. He'd go out in the garden at night, and slept behind the shed/behind a tree. But he was still with us in the mornings. He knew it was his time before we did. but that doesn't not make it the hardest damn thing in the world to do ever. We'll be here for you, if you want to let off steam or have a big sob. Loads of love to you, I know how heart breaking the decision you've got to make is.