Again,and what others have mentioned is to always slowly switch the foods. Switching all the time will cause upset tummies and loose stools. the smaller the puppy is the more dangerous diarreah becomes. Not only is dehydration a concern electrolye embalances, low blood sugar are all very dangerous. I do not know anything about probiotics, however it is a better choice to always discuss any diet changes and concerns with your vet. Especially if there are serious concerns about the health and needs of your dogs.
