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: We have been giving our 100 pound shepherd/lab/collie/husky mix Hip Action since he was a pup. Our vet believes this is realy going to help him prevent all the hip problems that shepherd's usually have. Eventhough I cannot buy it locally, I make sure to buy it on line so my boy will remain healthy and happy!
Example Output: Negative

Example Input: I'm very pleased with this dog food. Haven't ordered anything else for my dogs since I bought this. My lab and my malti poo both eat it happily and I'm happy that it is healthy for them.
Example Output: Positive

Example Input: I bought this a few years ago and really liked it. They must have changed the recipe because this just tasted odd, sort of medicinal.
Example Output:
Negative