Hartz® Ultra Guard® Flea & Tick Prevention for Dogs 61-150 lbs. Kills fleas. Kills ticks. Repels mosquitoes. For use only on dogs and puppies 12 weeks and older weighting 61 to 150 lbs. Kills. Fleas, Brown dogs ticks deer ticks, repels, mosquitoes. 3 monthly treatments. Starts killing fleas within 15 minutes. Net contents: contains 3 tubes, each 0.220 fl oz (6.50ml). Hartz® and other trademarks are trademarks of The Hartz Mountain Corporation. For more information, call our experts at 1-800-275-1414.