Hartz Ultra Guard Pro Flea & Tick Drops For Dogs And Puppies Weighing 5-14 lbs. For use only on dogs and puppies 12 weeks and older. Starts killing fleas within 15 minutes. kills fleas brown dog ticks deer ticks and flea eggs. Hartz Ultra Guard Pro Flea & Tick Drops For Dogs And Puppies Weighing 5-14 lbs. For use only on dogs and puppies 12 weeks and older. 3 monthly treatments. Pro Triple Action. Easy to use applicator. Starts killing fleas within 15 minutes. Kills: Fleas. Brown dog. Ticks. Deer ticks. Flea eggs. Prevents: Flea eggs from hatching. Repels: Mosquitoes before they bite. Ingredients: Active Ingredients:Etofenprox - 55.0%.*Piperonyl Butoxide (PBO) - 10.0%.**N-Octyl Bicycloheptene Dicarboximide (MGK 264) - 1.0%.Pyriproxyfen (Nylar) - 0.5%.S-Methoprene - 0.25%.Other Ingredients: 33.25%.Total - 100.0%.*(Butylcarbityl) (6-propylpiperonyl) ether and related compounds.**MGK 264 insecticide synergist.