when you girls are pg do you feed them on a fixed schedule or do you let them free feed. I have read that you need to make sure that the bitch doesn't get over weight as it makes delivery more difficult. The breeder that has the male that I bred abby to said to leave dry puppy food down at all times so they can eat when they are hungry. The books say only slightly increase the amount of food that they are eating. What do you guys do?