I don't do preaching but do you want to know the secret of life. This is what I took away from my experience. WE ASK TO BE BORN, we ask to leave a place of total love and peace to come to the world filled with trials and tribulations .. why the heck would we do that. We do that because we want to please God, we ask to do that to show that we understood everything he taught us about love, compassion, about helping each other, about taking care of his other creatures like Seamus. We ask to be born to please God. We make an agreement with him. Every pet that ever loved you is there with a beloved family member or friend waiting for you to come. I didn't want to leave not at all, I was booted back because it wasn't my time, but I came back with a lot of understanding I think. My take , my experience. Other doubt and that is ok .. this is my path. Your old dog is completely happy with you and all that you did for him. Putting him down you set aside your own desire and love for him to spare him suffering .. you did good.