Is your furry friend itchy due to fleas or allergies? Consider adding flaxseed oil to his diet. Depending on the size of your pet, add between 1 tsp (cats and small dogs) to 1 TBSP (large dogs) of cold-pressed flaxseed oil to your pet's normal food. The oil has a nutty flavor that most pets enjoy. The oil helps reduce inflammation and will ease your pet's itching.