The first picture is of his left hind quarter. You can see the crease of his muscle of his but. Also the second picture is of the left side to. (Sorry for him being so hairy. He's shedding)Also I see the cut on his left hind quarter.
The third and forth picture are of his right side. BIG deferents huh. Yes. His right side is just a flat smooth hind quarter.
So something went wrong somewhere and it needs fixing. I'm wondering if theres anything I can do to fix this or will he always be like this? One hind quarter bigger then the other.