I have always hated this question, although most clients ask it sooner or later. I have heard it so many times, over the heads of much-loved but declining pets. It's a horrible subject. Horrible and very emotive, but that's not why I have hated it so much. No, the reason I've always hated it, is because I never have the right answer - and that's not because I'm not a good vet. Rather, there is simply never a 'right' time to sign a bit of paper authorising the euthanasia of someone you love.