Flaxseed definitely helps the coat- to me it's among the best supplements you can add. It's so high in omega 3, which helps keep the heart and circulation system clean, and the fur beautiful.
For the rest, I've heard acidophilus bacteria (live) can help doggies with sensitive stomachs. And then glucosamine for the joints, etc etc, but to add linoleic acid? From what I've read, Omega 6 is much easier to get than omega 3 and omega 6 in too high quantities has bad effects on the body. It's not something that needs to be added usually.
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