Dr. FL33 is a 50: 1 ultra high concentrate natural alternative shampoo that does not contain soap or detergent. Since Dr. FL33 is safe to use with other flea & tick products, it is a must for summer season! Dr. FL33 is made with natural oils. Dr. FL33 also gently removes grease, oil and is safe on odors and dirt without drying the skin or coat. Dr. Fl33 is mild, pH balanced, natural and biodegradable.