FRONTLINE Tri-act Spot-on solution Dog 5-10Kg Fleas and ticks Horse flies Phlebotomists Mosquitoes 6 1ml pipettes Frontline Tri-Act spot-on solution is intended for dogs weighing 5 to 10 kg. 3 in 1 action: removes, treats, prevents. Frontline Tri-Act Spot-on is an anti-parasitic solution for the treatment and prevention of infestations by fleas, ticks, horseflies, sandflies and mosquitoes. Fleas are eliminated within 24 hours, preventing possible infestations in the 4 weeks following application. Frontline Tri-Act frees ticks within a maximum of 7 days, and those already present at the time of application will be eliminated within 48 hours. This product also repels mosquitoes for 4 weeks, sand flies for at least 3 weeks and horse flies for over 5 weeks after application.