Beaphar FIPROtec Spot-On for Large Dogs is a topical treatment containing fipronil for controlling fleas and ticks on dogs weighing 20-40kg, and for dogs over 8 weeks old. It kills fleas for up to five weeks and ticks for up to four weeks, and is applied monthly by applying the contents of one pipette to the dog's skin between the shoulder blades. Proper application involves parting the fur and applying the contents directly to the skin, and it is important to weigh the dog to ensure it is within the correct weight range.