We have two cats, and one of them is too lean.
Male cat is neutered, but female isn't (yet). Because of the male, we're using lower-calorie dry food.
We would like to start feeding the female normal rich food, but right now they're being free-fed and if possible we would like it to stay that way. With free-feeding we can only guarantee the female eats special when we're at home, but nothing would prevent her from eating low-calorie food when we're away.
Is it fine for her to eat both kinds of dry foods or would that cause digestion problems? We are positive she's good with both kinds when fed solely one or another.
Both cats are around 1 year old, Maine Coons.