A concentrated iodine-free teat dip composition is provided including sulfonated oleic acid, a metal chelant, and an aqueous acidulant wherein the diluted use solution has a pH of less than 2.7. A method of treating mastitis is provided including applying the diluted concentrate on an animals teats. Applying is accomplished by dipping the teats into a liquid solution, spraying the use solution onto the teats, or dipping the teats into or spraying onto the teats a diluted foamed composition of the concentrate.
