All in all, I'd say it's relatively balanced. You get two feats for Improved Unarmed Strike/Grapple, which works well for feat-starved barbarian type grapple builds, but I don't know that I'd consider that overpowering.
Looking at the picture, I'm surprised you went with a Con penalty. That tiger guy doesn't look frail to me at all.
On a personal note, I'd probably make the stats something like +2 Dex, -2 Wis and call it a day, but that's just my personal preference, not a balance issue. Although, as a general note, a Con penalty does hurt the race as a whole. Con is one of those stats that everybody needs, regardless of class.
The +4 on skills is better than most races, and you might want to trim them back to +2. Although, I could see adding in a Move Silently bonus as well.