I've always stayed with our pet's when they've been euthanized. With the exception of Mason, because I was out of town and we didn't want to prolong suffering any longer, but my wife and daughter were holding him.
How many people reading this have put their own dog down? I thought I could do it with our previous dog Dually, and felt I owed it to him to not take it to the vet. Instead, I found a better option and had the vet come to us on a farm call. I had him euthanized on our back patio. That dog earned the right to die at his home, with all of those that loved him surrounding him.