Hartz® Ultra Guard® Flea & Tick Collar For Dogs 7 Month Protection. Fits up to 26" necks. For dogs of all sizes. Kills fleas. Kills ticks. Fleas. Ticks. Full body protection. Water resistant - fresh scent. Net contents: 1 collar. To activate collar, hold at each end stretch and it's ready for your dog to wear. Easy activation. Hartz® and other trademarks are trademarks of The Hartz Mountain Corporation. For more information, call our experts at 1-800-275-1414.