Silver, I am sorry to hear of the loss of your pet, your "friend", I own and always have had dogs, cats and birds, etc.
I know all too well the heartbreak this kind of loss kicks us with.
I also know ther are no words that I can say to make you feel better at this present time, but if you need to cry, grieve, don't let people stop you or say something mean and stupid like, "It was only a dog, or animal", I despise people that feel that way, especially when you lose such a dear friend.
Let things go in your own time, remember this special friend, but also know you were an important part of his life and if it is true that there is a heaven , you just may see him again. If not hold the memories close to your heart and this will keep him in your heart and life forever.
Some of us at this time that we need to make the "decision" it is nature that we may have a sense of guilt, if you do, don't you did everything humanely possible.
You take care now, dear,
and feel free to come back and talk with us whenever you wish

DE

In giving advice seek to help, not please your friend
SOLON