When we bought Gracie, we figured that it was just the way she was built, and that she'd always have a butt bump, higher than her sides. My instructor was profounded to see this in a quarter horse. She said that she'd seen standardbred's built like this, but never a quarter. When we got her, she had NO muscle toning, but now that she's starting to get a bit more muscle back (After having a foal, and she's being ridden 5 days a week) she has started to fill in just a bit.
Here is pictures:
Second month we had her-
SO, what is your opinion on it? Will it fill in or is it going to stay that way? You can tell it's bone.