Given the task definition and input, reply with output. You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

Prior to switching to Newman's Own Organics Dog food, my 4 year old shih-tzu was crunching on Iams. Which was fine, except that every 2-3 months or so he'd have stomach problems. After switching, his poops have been firmer, no stomach issues in sight, AND his coat has gotten glossier (and much less flaky). Duncan likes his new food and so do I!
Positive