Okay, figure this one out. Yesterday, when I woke up, which was about 3pm, my dog was out of his cage and running around the house and crap (and there was water all over the freaking kitchen -_-; ). When Mom and Terry got home, I asked them about it and neither one of them claimed that they had let him out...
Then this morning when I woke up, which was at 1:30pm, I fed my dog, let him outside, all the regular stuff. Then I got back to the back bathroom to take a whiz and I find that the backdoor is wide open and the wind is blowing through the screen door. So, I looked around my house and, thankfully, I found no one... But still. It's weird.