Blue Buffalo Weight Control Natural Dry Cat Food Adult Chicken and Brown Rice 1.4 kg

Q: What so the Carb percentage? Not on label.

I do not know the answer to your question, however, I can tell you that this weight control food took my obese, 20# Tuxedo cat down 4# in 6 months.

Q: Is there a formula for hair ball reduction?

Yes, there is an indoor health formula, which helps with hairball management.http://bluebuffalo.com/cat-food/bc-indoor-health-chicken?pf=1&type=dry&animal=cathttp://bluebuffalo.com/cat-food/bc-indoor-health-salmon?pf=1&type=dry&animal=catBoth of these support hairball control.