I'm so very sorry. It's a very hard thing to have to live through. I had to make the same choice with my dog three months ago. I can tell you that it's not easy. I, too, know my heart will never be the same. Even though you know it was the right thing to do, it still hurts. Don't be surprised if you feel guilt, also. I still feel it. It will just take a lot of time for the pain to not be so bad. Maxie is well loved and waiting for you at the RB, as are all our dearly loved ones.