ACTIVE INGREDIENTS;(S)-METHOPRENE 1%OTHER INGREDIENTS: 99%BUCKLE COLLAR AROUND DOG OR PUPPIES NECK. FIT COLLAR SNUG ENOUGH TO PREVENT PLACEMENT OF THE DOG"S/PUPPIES LEG OR LOWER JAW THROUGH THE COLLAR, YET LOOSE ENOUGH TO BE ROTATED ABOUT THE NECK. LEAVE 1-2 EXTRA INCHES ON THE LENGTH OF THE COLLAR FOR ADJUSTMENT, CUT OFF EXTRA & DISPENSE IN GARBAGE. CHECK PERIODICALLY & ADJUST FIT IF NECESSARY, ESPECIALLY WHEN PUPPIES ARE RAPIDLY GROWING. MAY BE USED IN ADDITION TO REGULAR COLLAR. WHEN COLLAR IS FIRST WORN, OBSERVE NECK AREA EVERY FEW DAYS FOR IRRITATION OR ADVERSE REACTION. REPLACE COLLAR EVERY EIGHT MONTHS IF NECESSARY. ADAMS/FARNAM PET PRODUCTS TAKES FULL RESPONSIBILITY FOR THIS ITEM. CONTACT THEM DIRECTLY IF THERE IS ANY PROBLEMS OR ISSUES (800) 234-2269.