Scheduled feeding will definitely help her put on weight. You can't really monitor how much she eats if you're free feeding and this becomes extremely important when she has a litter of thirsty puppies depending on her to eat.
I feed raw and I usually feed once a day, but I started increasing to twice a day when she was about half way through her pregnancy. As her uterus grows with the puppies, her tummies has less space to expand into and she can't eat as much at any given time. By the time the puppies are four weeks old, I feed four or five times a day.
Don't supplement with anything except folic acid until after the puppies are born. Chicken livers are a great source of folic acid and it prevents cleft palates and other spinal defects. Feed the best puppy food you can afford (Orijen or something grain-free would be great) and make sure she eats.
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