Bob Martin Clear Plus Spot-On for Large Dogs – 3 PipettesKills fleas for up to 4 weeks Kills flea eggs for up to 8 weeks Kills ticks for up to 4 weeks, helping to reduce the risk of tick borne diseases Kills biting lice Breaks the flea life cycle by killing flea eggs and larvae Spot on solution for dogs, containing Fipronil and (S) methoprene For medium dogs over 8 weeks old, weighing between 10 20kg