All I know is all my dogs digestive issues disappeared. Even my dog with chronic enteritis could eat it without problems. That dog also had the start of heart problems which slowly disappeared after switching to Purina. I'm a Purina fan now.Yesssss I love Purina. I too tried just about everything and switched Brew constantly as a puppy but he always did best on Puppy Chow and liked it best. Then I tried Purina One and he LOVES that but switched to Dog Chow for a bit as it was cheaper and easier on my wallet LOL he liked that too but I recently switched him back to Purina One, the Healthy Weight formula this time, cause heās a bit fat lol but the cat is in Purina too. Senior Cat Chow. She loves it and does great. The birds used to be on Purina too lol I would have had the budgies on it if they made budgie food![]()