These are the original sketches drawn of the Taurcanis Draco. When I originally thought of a summoned dragon, I pictured one with a more traditional snout, but gradually wanted it to be something else. Bulldog muzzles seemed like an interesting choice, and this was the initial result.

This design is closer to the anatomy of actual Bulldogs, or at least of the varieties I found images of. In my mind, however, I pictured more of a hunch with the back going above the creature's head. The wing size was also a little more realistic early on, too, but I prefer the stocky look it wound up with.

It's cropped out of the image here, but I also originally gave it a fairly long tail. You're not missing much of anything. I had only sketched a couple of very faint lines to signify such a thing.

One thing I hadn't taken a good look at before sketching this was bulldog skulls, which impacted the final design. I had only looked at, um, "complete" pictures of bulldogs while drawing these. It was after I found myself unsure of the head shape that I started looking at images of the actual skeletal structure.