This brief goodbye letter is addressed to a deceased pet.
Dear {Pet},
I am so sad that the time has come for you to leave this world. I loved you very much, and I could not have asked for a better friend. I will always remember how you {happy memory of pet}. You were loyal and wonderful to the very end. I am glad to know that you are now at peace.
Please know that you will never be replaced in my heart.
Your owner,
{Sender}