"I have a large dog, and he'll go inside but then comes right out, and I think that even though it's the largest available, he can't stretch out in it. There's a lip on the front door, it's not flat. I guess they put it there so water wouldn't flow into the house, but all he can do is curl up in the house, and so far he hasn't. He can't stretch out in it because that lip is a couple inches above the floor so he can't put his paws or any of his body out of the door.
I'm gonna keep it anyway, hopefully when the snow starts falling and it gets colder, he'll try this more, but right now he doesn't. He's an inside dog, but I keep him on a run outside during the daytime, so the house is near this."