Question about my cats feeding

Is feeding my cats dog food wrong?? When I feed my dog, my cats steal his food, is it healthy for cats as it is for dogs? I heard it has too much protein, for cats, is that true???

 

Answer from Dr. Gaylord Brown:
If you were just feeding diet dog food, depending on the brand, you would be able to feed more. How much green beans are you feeding? Taking into account the pumpkin and the green beans you are probably about right on the calorie consumption. Weight loss without some feelings of hunger is almost impossible. OM by Purina calls for 2 5/8 to 3 cups per day for a dog your size to loss weight, but that is without green beans and pumpkin.