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.

If you have a dog, you probably know the distinctive "dog fart" odor. This food, for some reason, multiplied that for one of my two dogs. It really turned our house into a constant dog gas zone. Wow. It's supposed to be a pretty good dry dog food, but beware of the possibility of DOG GAS.
Negative