Four weeks ago my 10 year old Whippet went downhill (sleeping alot,no energy,no interest in food) very fast but I put it down to the fact that we were moving house and he is very sensitive to change. I took him to the vet where he stayed for a few nights on a drip.When he came home he had loads of tablets but because I couldn't get him to eat ANYTHING I couldn't get the tablets down him.He looked permanantley drugged with no energy so I stopped them and within 24 hours he was back to normal wanting to be walked and eating like a horse.He started on Hill's KD diet 2 days ago but last night I was up with him 4 times with the runs and trying to be sick (he did eventually).I don't know what I am supposed to do?Will he be in pain?How long is he likely to live for?