
Don't give her milk. Right now she just needs a good quality diet, one that lists meat or fish as the main ingredient. And water. Most dogs are lactose intolerent and don't NEED milk, especially not cows milk, even if pregnant. It's by far best to concentrate on keeping her lean and fit - just like a human when pregnant, she doesn't need to be putting on a load of weight and her puppies will take all they need in any case. Once she's whelped and you see how many she has to cater for, then you up her meals, especially into the second week when she'll be having to provide lots for her brood. Right now, as she increases in girth, you may have to cut back on the bulk, and concentrate on protein - feeding her smaller amounts more often if she has a load and reduced stomach space

Now is the time to get yourself a good experienced mentor.