For the treatment and prevention of flea (Ctenocephalides canis, Ctenocephalides felis) infestations in dogs only. Fleas on dogs are killed within one day following treatment. One treatment prevents further flea infestation for four weeks. The product can be used as part of a treatment strategy for flea allergy dermatitis (FAD). The product has a persistent acaricidal and repellent effect for four weeks (Rhipicephalus sanguineus, Ixodes ricinus) or three weeks (Dermacentor reticulatus), respectively, against tick infestations. Ticks already on the dog may not be killed within two days after treatment and may remain attached and visible. Therefore the removal of ticks already on the dog at the time of treatment is recommended, in order to prevent them from attaching and having a blood meal. One treatment provides repellent (anti-feeding) activity against sand flies for two weeks (Phlebotomus papatasi) or three weeks (Phlebotomus perniciosus) respectively, against mosquitoes for two (Aedes aegypti) and four (Culex pipiens) weeks respectively and stable flies (Stomoxys calcitrans) for four weeks.