An excellent value from the K9 Advantix brand K9 Advantix Classic Dog is a 30-day treatment & prevention protects for dogs from fleas, ticks, mosquitoes, biting flies and lice. Affordable formula works on contact to kill and repel fleas on dogs within 12 hours of application even without a bite Easy-to-apply topical treatment is fragrance-free and waterproof after 24 hours No prescription needed. 2 Monthly Doses