I call DH on the way home from work yesterday. On Fridays the dogs are alone longer than any other day of the week, because DH goes into work earlier. I told him I would stop home, let the dogs out, and go run some errands. I wanted to make sure he didn't need anything else. He said the dogs were fine, because he left them outside with a big bowl of water when he went to work.
I had to go home anyway, because I left some essential things at home that I needed for the errands (shopping list). Imagine my surprise when the two dogs greeted me at the door. It took me a minute to realize, they figured out how to open the patio door. Now, we make sure the door is locked when we let them out. It is not going to be fun trying to kill all the flies that got in, but I am so amazed at how intelligent my dogs are.