Beaphar FIPROtec Spot-On Solution Dogs kills fleas and ticks on small dogs and continues to kill fleas for up to 5 weeks and ticks for up to 4 weeks.It is important to establish a regular flea control routine for dogs and the household. Dogs who spend a lot of time outside are especially at risk from fleas and ticks. Small Dogs: Suitable for dogs over 12 weeks of age and weighing between 5-10kg.Medium Dogs: Suitable for dogs over 12 weeks of age and weighing between 10-20kg.Large Dogs: Suitable for dogs over 12 weeks of age and weighing between 20-40kg.X Large Dogs: Suitable for dogs over 12 weeks of age and weighing between 40-60kg.