SWITCHING FOODS Although you'll want to get started feeding Purina® right away, it's best to transition your dog from his current food over a 7 to 10-day period to avoid digestive upset. Simply feed a little less of the previous food each day and a little more of the new food, until you're feeding Purina exclusively. This is especially important when changing from dry to canned or wet food. Staying healthy on the inside Sometimes a diet change, stress or other factors can cause your dog to experience soft stools or diarrhea. Talk with your veterinarian to see if a probiotic such as Purina® Pro Plan® Veterinary Diets FortiFlora® Canine Probiotic Supplement is right for your pet. FortiFlora contains a probiotic that promotes normal intestinal microflora balance and can help get the GI system back on track. Easily sprinkled on food, it can be fed to puppies and adult dogs.