So I have a Cardi (Female) who is 33 lbs and I keep being told she is overweight and now someone said she is obese. She was getting a cup a day of purina pro plan select and now is on California Natural weight control. How fast do they lose weight?. She does get exercise mostly everyday but I feel bad if I cut back on her food.I feel like I am starving her. I have tried using green beans/ rice but nothing seems to help. She does get the occasional lamb jerky or a rawhide but no table scrapes Any suggestions?.