If I was at home (I'm up at college) I'd find our plans and/or give you measurements. I think I obtained our plans from a Gun Dog magazine years ago. But to give you an idea, the front of the roof (the side where the door is) is higher than the rear by an inch or two to allow water to drain to the rear. Looking at the front it's probably about 3.5 ft - 4ft wide with the same depth, and the door is off the one side. It sits on legs about 3 inches off the ground.

We also insulated the houses and put vents on each side. We insulated them on all walls, bottom of roof and floor. The insulation can be removed.....it sits between the outside wall and a thin inner wall (which is also removable). We did this so could have two houses in one and use the vents in the summer. Hopefully this helps, or a least gives you some ideas.