I just saw this post as I am new to the forum. I have bred dogs for 35 years.The people who are recommending a high quality dry food are correct,but supplementing with a high quality canned dog food would be very beneficial.This way she will be getting the extra fluid and it will be a balanced diet. The only thing you might add would be organic full fat yogurt.Canidae is a good choice, Wellness is another and both are easy to find.Avoid Iams, Nutro, Science Diet,Purina basically anything you can buy at Wal Mart.It is hard to overfeed a nursing mother on dog food,it is when you start adding in the extras like meat and such that you can run into trouble,unless your dog is used to it and you are knowledgeable about calcium/phosphorous ratios.Do make any changes gradually and follow feeding guidelines by the manufacturer. I wish you were close to me, I have been wanting a large breed puppy. Good luck with them.