I'm so sorry for your loss. Losing pets has been very hard for me too. Just know that your strong grief means that you loved your puppy dog the best you could and gave him the best possible life. No pet will ever replace moose but when you feel ready, a new pet may help with your grief. I am sure you puppy would want you to be happy, just like he did when he was alive. Again I am so sorry and my heart aches for your loss.