Soy lecithin consists primarily of phospholipids. Most allergies are tied to proteins and soy lecithin does not contain any soy protein. Additionally, soy allergies in dogs and cats are rare. We have been selling Daily Health Nuggets for over 25 years with thousands of repeat customers, with no evidence of a negative reaction to lecithin. In fact, pets experience dramatic improvements and relief of most allergy symptoms. Lecithin helps soothe the skin, improves dry skin and promotes regrowth of hair.