Frontline Tri-Act Spot-on Dog 2-5kg is a pesticide for mini breed dogs to treat parasite infestations. Blood-sucking parasites cause itching and redness of the skin which can cause disease. Frontline Tri-Act is an anti-parasitic solution to be applied to the skin of your four-legged friend for the treatment of flea and tick infestations and against mosquitoes, sandflies and horse flies. Its triple action helps treat, eliminate and prevent attacks from the most dangerous parasites for your dog's health. Frontline Tri-Act combines the action of two active ingredients, fipronil and permethrin, which allow the product to have not only a preventive effect on flea and tick infestations, but also the function of an insecticide against sandflies, horse flies and/or or mosquitoes, which are all vectors of diseases such as leishmaniasis.