Hah, I always do that. xD I like keeping both the blank outline and a colored copy. Even if printer paper kind of lacks the texture I would get if I was brave enough to color the original..
Hm. Like you said, the anatomy is really awkward. Especially the back. o: It looks either broken, or like it's.. a compact model. xD If you follow a curve from where its butt is now up to where it would be in a normal pose, that normal pose would end up with an extremely short spine.
I'd say your best bet would be to go back and try to move it into a more gently-sloping pose. This one's a little impossible, although it is easy to tell what you were trying to do. Actually kind of reminds me of a drawing of Uweh's that had a somewhat similar pose..
Also. The snout looks pretty long and dog-like. I dunno, it might be a personal preference, but I just had to mention it. Mostly because I used to have the problem of always making dog snouts myself, so it tends to bother me a little. xD If you do have problems with that, you might wanna try doing a few cat-snout studies. Maybe watch the Aristocats about nine thousand times. That certainly helped a lot for me.