Hi Alyssa. Nursing moms need a lot of calories to keep up with those puppies, so increasing not just the volume of the food but ensuring that it is higher calorie can really help during this time. Feeding the mom puppy food as Molly suggested is a great way to increase calories. If you can afford to add some puppy formula to mom's food, that can also help. When I've fostered moms with pups, I've fed the moms as much food as they want, over multiple meals each day. Just keep those calories comin'!
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