A low poly model of a dog I made over a few hours last Sunday, when I had some extra time :) I designed it by using a lot of quads and as few triangles as possible. Of course, the stl format only uses triangles so you can't really tell by looking at the mesh.
I printed two versions with different sizes. The smaller one is about 4.5cm high and the larger one is a 230 percent scaled version of the small one.
Since the surface area against the print bed is quite small I recommend also using a brim/skirt. And lots of glue stick.