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.

Example Input: I have been giving these chews to my Mini-Pincher and Mini-Dauchand for the past 3 years to help support their joints and hips.  The last batch I bought is darker in color to the point of almost being burnt and smells a lot more.  It made my Mini-Pincher sick to the point of vomiting and liquid stools.  I am going to shop for a better product that is made here in the US . . . I have been looking at GNC products for Dogs and that is probably the route I will take.
Example Output: Negative

Example Input: Our cocker spaniel is now nearly 10 years old, and the solid gold food I'd been feeding him suddenly changed its formulation over a year ago(with no notice on the packaging), and he became subject to unexplained stomach upsets.  After the contaminated food scare even tho Solid Gold was not recalled, I decided to switch, and this formulation is perfect for him to not gain too much weight.  Newman's own is a brand I totally trust and have bought snacks for my human baby as well for years.  After a year on this food, my dog is doing fine, but I do notice a need to supplement with fish oil for a healthier coat.  That may be age related as well.  But the stomach upsets have stopped.  And I feel better knowing I am not exposing him to additional pesticides and hormones by going mostly organic with this formula.
Example Output: Positive

Example Input: Looks fresh and clean; I have roasted it in the toaster oven and I also use it in food whole or ground up in the coffee grinder.
Example Output:
Positive