I looked at the picture (Chance?). Without meeting him in person and/or seeing better photographs of him, he does appear to be a tad cow hocked and that's not the worst flaw that a horse can have or uncommon; however, it can cause a horse to knock his hocks together when he walks/moves. If it's constant and hard, he may have soundness issues now or later in life. I suggest asking a good farrier out to give him an evaluation and an expert trim. A farrier may be able to work on his angles now and/or over time and help the problem a bit. He is also quite straight behind, there's really nothing you can do for that, I don't think.
What do you intend to do with him? Is he just a pet or do you intend to drive and/or jump him?