You might be describing a cow hocked pup (legs close together in the back). Our pup is too, it can often improve with age, from what I hear.
Also, I'm not sure "sloppy sitting" as I call it, has anything to do with HD either. I've had my last two pups who sit this way often too.
I'm not an expert, but the dog I had with sever HD was dragging his legs while walking, struggling to get up, was "bunny hopping" and was in obvious pain. So maybe these things are all relatively normal? Just speaking from experience
hope she's ok
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