Quote: "my only crit is there is a gap in the tiles right on the apex of the roof try to add a ridge tile"
Haha, that's only part of the design. You can't see it, but structurally these shingles are attached to a plate that is connected to the actually roof of the dog house (which is white). Naturally it can get hot inside of a dog house, so imagine their being a vent that is shielded by the roof, and is protected by water falling through the small gap at the top (hot air rises) by a long diagonal beam that channels the water out the back.
You can see the small gap and the actual roof of the dog house better here:
"If I have seen a little further it is by standing on the shoulders of Giants" - Isaac Newton
-Computer Animation Major @Baker.edu-