Vectra 3D BLUE for Dogs & Puppies 21-55 lbs Anywhere in the country, it's always possible for fleas, ticks and other dangerous vectors to infect your dog. It only takes one bite to potentially spread disease. That?s why you need the fast-acting, long-lasting, broad-spectrum protection of Vectra 3D. Fast-Acting Kills through contact; parasites don?t have to bite to die. Begins reducing flea feeding in 5 minutes; kills fleas in 6 hours.; Broad Spectrum Protection Repels and kills fleas, ticks, mosquitoes, biting and sand flies, lice and mites (excluding mange mites). A repelled vector does not attach or bite your dog; therefore repellent action may reduce the risk of vectors spreading disease to your dog. Kills adult fleas and prevents the development of all immature stages of fleas: eggs, larvae and pupae for 30 days. Long-Lasting Remains effective after bathing and swimming. Protects for 1 month. Convenient Protection for puppies as young as 7 weeks of age. Patented applicator makes it super easy to use.