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Linseed is also known as flax or flaxseed. The seeds contain high levels of good quality dietary fiber, lignans (natural antioxidants) and an abundance of other micronutrients.
Linseed's main benefit though is its high proportion of health-boosting omega-3 fatty acids. Although these aren't quite of the same standard as the omega-3's found in fish oils, they are still fantastic for your dog's health. The oils can be extracted from the seeds and added to foods as linseed (or flaxseed) oil.