There are a ton of joint supplements for dogs. I wouldn't recommend anything at GNC, especially their store brand, personally -- not the most reputable company. The difference here is two things: the forms of the chondrointon and the glucosamine may or not be the best for a dog, but aren't for a human, and the avocado is definitely unusual, so that might be hard to find elsewhere. But again, there are many many dog supplements for the joints that might be different but work just as well or better -- a question no one can answer definitively.
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