Usage:1) First, eliminate the cap of the dropping jug. 2) Lift the hair from the rear of the pet’s neck until the skin is noticeable. 3) Then use the drops according to the weight of the pet. 4) Drop once every other week to kill new fleas and for first time usage (optional). Dosage: 10kg (1 Bottle). 5kg (1/2 Bottle). 2.5kg (1/3 bottle).