This is my first experience with having puppies and the mother is having some very loose stools. The pups are 5 weeks old and very healthy. Mother appears and acts healthy as if she feels well, has a sheen to her coat and is very energetic. She's been having these loose stools for a week or so I suppose. Is this normal? I've thought maybe it was caused by her trying to clean up after the puppies. She's been wormed before having puppies.