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.

Let me give you an example: I have bought several of the Vitality canned dog food products and have found them all to be of good quality. The product looks more like a stew than a processed meat and it smells better. My Labrador is finicky and she appreciates this product better than most.
The answer to this example can be: Positive
Here is why: It's a positive review because the owner of the dog is satisfied with the product and mentioned that their dog appreciates the product.

OK. solve this:
The dogs had been eating Purina for a long, long time. I switched to Newman's Own and I noticed something only a dog owner would be conscious of...the waste. They no longer expel foul odorous waste, which Purina seemed to do to them regularly. Since they've been on Newman's, their waste is almost odorless and, well...it is easy to pick up. You can tell it's nutritious by what comes out, and if you have to pick up after your dog daily, like myself, you'll appreciate the cleaner output.
Answer:
Positive