I think there's a little confusion here. The color enhancing shampoos are dog shampoos, and most of them are high quality shampoos. Used properly they aren't going to dry out the skin or coat, and shouldn't cause any problems unless the dog has an allergy to one of the ingredients.
And honestly, there isn't that much difference between human and dog skin. The major one being we have lots of sweat glands and dogs don't. That pH thing people like to toss around isn't that big of an issue when it comes to shampoo or conditioner.
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