Early-onset dementia or brain fart?

I was out of the house for 6 1/2 hours today and at about hour 6 I had a moment of panic. I thought for a brief second that maybe I had left Max outside in 90 degree heat. I literally couldn't remember letting him back in right before I left. It made my heart race. I tried desperately to remember some part of the leaving process...I didn't give a treat as usual because he had already had one earlier...I couldn't remember saying "Maxie stays" like I do when he tries to leave with me. Nothing. But, I decided that I must have let him in because, while being the absent-minded professor that I am, I could never FORGET to let my dog back inside before I left. Right?! Also, now that I really think about it, had I actually walked out the front door and to the car, Max would surely have come trotting over to see what the hell was happening. He can get halfway up the walkway between the house and garage and would definitely have noticed me in the driveway. Yes, this is not something that could happen. Ever. For crying out loud. I need a beer. Or two.