The dog finished what he needed to do and I pondered on the poo some more. Did someone come riding through in the early hours to look at my horses. Weird, but possible. More likely, one of mine got out and sweetie put him or her back in the fence unbeknownst to me. I planned on going straight to the house to ask, but then a little voice said "Go check the barn."
This is what I found.
Nestled in an open stall was my goat, Goat, and this forlorn looking Appaloosa mare in a red halter. All I can figure is Goat took one look at her and said "Hey, pssst, come with me." Turns out she belongs to some new renters over the hill. I fed her carrots, gave her a good grooming, then led her back home.
I hope Goat will forgive me, but don't tell him, I sort of wanted to keep her, too.