Our first litter is due in about 12 days. Thankfully, our girl is an easy keeper and has done well maintaining condition on her regular kibble (Orijen). I'd like to add some more calories to her diet so we don't fall behind but we can not increase her kibble as she gets diarrhea anytime that we feed more than her normal ration. What are the other options for supplementing their diets in preparation for whelping and lactation? Thank you.