I am fostering a momma dog and her puppies. I just got them on Tuesday, and have been introducing softened puppy chow mixed with canned food about every four hours. A couple of them seem to like it, but others don't even lick at it. Mom doesn't want to nurse much any more. The puppies have sharp little teeth, and I'm worried they're not getting enough food. By the way, there's TEN of them. Any advice? Thanks for looking.