Attach a note to the collar.
He came back again last night. Soon as I walked up the porch he was there sitting,stuck his paw out like a hand shake as if to say, " Hey buddy, whats crackin tonight? " LOL..
After a bit of water and a tortilla, he curls up on the rug I have put outside, and is out for the night.
I think I will put a note in his collar. Great Idea.