he is not dead just reflecting on the good times you guys had will allow you to see him, he wont be dead just exist at a different frequency.
damn... I'm really sorry this happened. My dog and I are virtually inseparable.. I can't imagine what it would be like to wake up tomorrow and not have him. Stay strong and try to comfort yourself in the memories of how much love you showed him/her while he/she was still with you. That will probably help, at least a little.