At this risk of some people complaining about how I pen my dogs, I have put a photo of Jock's pen in here. As you can see, the pen is more than large enough for him, its in my lounge room (which is warm and out of the weather) and he absolutely loves it.
When this photo was taken, there was no bedding in his pen as it has been taken out to wash. He just loves playing in the mud and hasn't mastered the art of wiping his feet before going to bed! lol

Now, I do have a bigger pen (shown to the right of his trolley) which I built especially for Jock, but he is not interested. He likes his 'mobile home' and he isn't about to give it up easily. So, until I can convince him otherwise, he gets his way.