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.
My little one had a Hemangiopericytoma removed from her leg and I'm doing what I can to prevent the likely recurrence for as long as possible.