My cat whins for food constantly even right after he is done eating he is whining for more

Are you feeding him enough?

My cats have recently been switched from dry IAMS to a grain-free dry cat food. They eat less of the new food and complain about being hungry a lot less.

A vet visit, stool analysis may show the kitty has worms. These are common and eat food in the cat's digestive tract. Even a cat that is kept indoors should be tested.