This will depend on their breed, size, and current weight. It’s best to talk to your veterinarian so they can give you a guide for her food intake.  Usually, pregnant dogs need to eat 10 to 15 calories more per pound than their non-pregnant counterparts (or about 2-4 times higher their normal calories). For example, if your dog ate 20 calories per pound and weighed 100 pounds, now they would consume 30 to 35 calories per pound. This would be for a total of 3,000-3,500 calories a day.