My dog keeps on barking and whining for more food, even when we feed her about 4 cups every day. Why? (read details)
4cups seems a bit excessive unless she is super active and a larger breed. I would call your vet to discuss.
Are you sure it's food she wants?Water? A walk? Play time?
Call a vet or bring her to a vet. Maybe worms or intestine problem. My last dog ate a lot but he just was a over eater doc said. Always rule out possibilities.