About this item Trusted for 15 years, Vectra 3D Extra Small Dog Monthly Treatment & Prevention protects dogs 5 to 10 lbs. and 8 weeks of age or older from fleas, ticks, mosquitoes, lice, mites (excluding mange mites), and biting and sand flies Begins reducing flea feeding (bites) in 5 minutes. Kills fleas in 4 hours. Repels and kills fleas, ticks and mosquitoes, no bite required Easy-to-apply topical treatment that is quick drying, fragrance-free, non-greasy and waterproof after 24 hours No prescription required See more product details