Given the task definition and input, reply with output. Given an English language product review, determine if it is a Good Review or a Bad Review. A good review is one where the product's review has positive tone and Bad review is one where the tone of product's review is negative.

Our dog is always playing with these tennis balls. He carries them all over the house. They are sturdy for a large dog. I have bought cheaper tennis balls and he has chewed up both in no time. So far so good on these. I think they will stand up. We keep buying this brand. Great product!
Good Review