I tear up when I read these. They are family. I'm 6 foot,250 pounds and when I lost 2 of my fur babies at one time last year, I stood out in the yard and cried like a youngun as I buried them. I'm sorry.
I knew from the thread title what the topic was going go be, dang it. Sorry to hear this. It's unfortunately one of the jobs that comes with pet ownership. Your last gift to them, I like to think of it.
Get another one soon. It's much better than waiting.