We closed the dog door so they have to stay in. Ruby is fairly responsible, but Brewster is not the smartest (he's the sweetest- but he's no rocket scientist)
He goes out, runs full speed for a short time, and pretty much collapses in a puddle of drool. It takes him so long to cool off.
Dexter, our boy that died a couple of years ago, had a stroke due to this samw behavior. He lived for almost two years afterwards, but had to be hand watered and fed. It was a rough two years. I don't want to go through that with another dog.