My old dog stopped sleeping on his comfy dog bed next to our bed, where he had slept for thirteen years, and starting sleeping on the floor in front of the fan. I tried moving his bed, buying him different beds, moving the fan, etc. No, he just wanted to sleep on the floor in front of the fan. I think their temperature regulation changes as they age, maybe.

This is just a guess, but I have wondered too about old dogs wanting to be outside more because they have less control over their bodily functions. Maybe they always feel like they have to urinate, and can't hold it very long, so they feel nervous in the house, not wanting to have an accident.

I think too, as their hearing and sight become less sharp, perhaps they are nervous due to being startled by all the activity going on in a house. I know I have come up behind Keito recently when he has been asleep and scared him. He didn't hear me.