My vet suggested cottage cheese with a teaspoon of flaxseed oil so they get a little bit of that every night. My dogs get steamed veggies (minus onions or garlic) a couple of times a week. I also give them bread and meats.
Flaxseed oil isn't as good for dogs as fish oil... more Omega 3 in fish oil. Cottage cheese and flaxseed oil is a very popular recipe for dogs (and humans) with cancer beacause of the way the two ingredients interact with one-another. I give cottage cheese or yogurt to my dogs with their raw food.