I have been lurking on this thread for awhile and I feel like most info provided has been good advice. I just wanted to add that just because she spent a few hours at your house OP, does not mean the puppies are dead or starving. By my calculations, they are over a month old, correct? They are probably not feeding from mom much anymore, if at all. So if you check mom dog, she probably won't have milk. The owners are probably giving the puppies dog food soaked in either water or some form of milk. Either mom's milk or goat's milk. Considering, I highly doubt they are milking mom dog, I bet its goats milk or water. Both are perfectly acceptable to use on puppies. They will be completely weaned onto dry dog food soon. Mom can spend hours away from them and they will be fine