What others said when purchasing this item. Tried giving her the 50/50 mix again for two more days and she threw up both times again. The pet experts at Purina have provided the feeding amounts indicated as a starting point. Purina Pro Plan vs. Purina One. We highly recommend this product based on what it has done for our dog. The vet has worked w/us and was very concerned about Buddy. To properly compare Iams and Purina One, we'll use up-to-date nutritional and price information.. Product Title [Multiple Sizes] Purina ONE Sensitive Stomach, Sensitive Skin, Natural Dry Cat Food, Sensitive Skin & Stomach Formula. To help your dog maintain an ideal body condition, monitor your dog's weight on a regular basis, making sure that his ribs are easily felt and the waist is visible when viewed from above. No Supplements Necessary: Purina ONE provides 100% complete and balanced nutrition for maintenance of adult dogs. If you have a puppy, or a pregnant or nursing dog, feed Purina ONE SMARTBlend Healthy Puppy Formula. Iams vs. Purina One. Proper diet, exercise and veterinary care are the best ways to keep your dog healthy. [CDATA[/* >