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I am not aware of any foods or supplements that would make a difference….however, have you considered cataract surgery for your pet? Click on link for full article: https://www.mspca.org/angell_services/cataracts-and-your-pet/

What are the alternatives to cataract surgery?
Cataract surgery is an elective procedure. Dogs with impaired vision, or even complete blindness in both eyes, adapt very well and can continue to be a happy, healthy, integral member of your family.