Advantage - For Dog And Puppies 11-20 Lb 4 Month Supply is a monthly application that kills 98 to 100% of fleas and their larvae within 12 hours. And it kills reinfesting fleas within two hours. One convenient application of Advantage keeps working for up to 30 days a month. Flea bites can cause discomfort for your pet, lead to skin infections, lead to allergic skin reactions causing irritation and can even transmit other disease-causing organisms, including tapeworms. It is available in Red color