buy a sheet of 3/4 plywood ------- the walls are 2' X3' and the ends are 2 X 2--------- 1 sheet makes a perfect dog house for about $15,,, its better than a barrel--- the top is flat and the dogs like to lay on top of it and look around.
Been there done that. Not going there again. Wood does not hold up, it's not water proof, no door and a dog doesn't like a wood dog house better than a barrel. I have a barrel house that is about 5 years old now and still almost perfect condition but it is just open at the door.
And that wasn't the question. But thanks anyway.