Everyone else has expressed my feelings so poignantly. My heart goes out to you. It's been 4 years since I had to make that decision to let my Lab Jingles go, and still it hurts. It is one of the hardest decisions you will ever have to make. All I can say is follow your heart; it's hard to explain, but you will know when. When you see your devoted friend is no longer enjoying life, takes no joy in things he used to love, when his discomfort is intolerable, he will let you know. But as sad and painful a day as that will be, take comfort in the knowledge that you gave him 5 wonderful, loving years...the best years of his life; and for that, he will always and forever be grateful. We are all here to support you, so please talk to us as often as you need to.