Im learning blender for 2 weeks now, and this was the first time i retopo'd something. I cheated a bit, because i sculpted the dog first cause wasn't able to do it just by adjusting single verts on a flat picture plane. In future i wish to create semi-realistic characters, and to be able to animate them as good as animators from pixar/sony etc do, so i appreciate any help leading me there. Have a good day!