He's Atascocita Gary, right? If so, his racing weight is listed at 76lbs. Judging by that alone, he's overweight. He doesn't look fat in the pictures but you can tell he's carrying some extra weight. If it were my dog, I'd cut him back to 80 lbs and see how he looks there. Just my two cents.
Did Gary have any injuries on the track? His last race says he trailed.