When our readers ask about eye supplements, the request is almost always the same: a senior dog with cloudy eyes, or a breed prone to retinal issues, and an owner who wants to do something supportive. We approached this category the way we approach all canine health products, by reading every label against published research on lutein, DHA and antioxidants rather than trusting the front-of-bottle promises. What we found is that these chews vary widely in how much active ingredient they actually deliver and how clearly they disclose it. A supplement is not a treatment for cataracts, glaucoma or progressive retinal atrophy, and we want to be clear about that up front. We recommend treating any of these as supportive nutrition only and talking to your veterinarian before starting, especially if your dog is already on medication or has a diagnosed eye condition.

Sources and further reading