I am so so sorry. I know he meant everything to you. I feel like anything I try to say will sound inadequte, and that nothing will really help, but he had the best life any dog could have and he passed on knowing how much you adored him. I feel so sad for you, but he is no longer in pain and he will be well loved until you meet up with him again. He will always be with you in your heart and memories and you will feel his comfort by your side just as if he were here. I'm so sorry.