Hartz® Ultra Guard® Fresh Scent White Flea & Tick Collar For Dogs. Fits up to 20" necks. Kills fleas. Kills ticks. Full body protection. 7 month protection. Water resistant. Net contents: 1 collar. Hartz® and other trademarks are trademarks of The Hartz Mountain Corporation. For more information, call our experts at 1-800-275-1414.