Instruct: Classify the given Amazon review as either positive or negative.
Query: Dog likes them, not sure if how effective the glucosamine is

Dog likes them, but not really sure if the glucosamine does much, or if there is even enough to make a difference. My dog is not exactly old and limping around so I'm not sure you would see much of a difference. He is getting a little older and I just want to get him a healthy snack.