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Our pet is now about 78 pounds-probably her adult weight. Our first Bernese was just about the same weight. I have heard everything from giving vitamin C, to fish oil tablets, to glucosomine and chron. etc. What would do or not do and what food would you suggest. She loves Iams adult and Pedigree and the Purina vegie-meat food, called Bountiful, I think-actually, she enjoys about everything. We haven't settled on an adult food yet. But want to do so.