K9 Advantix^® II kills fleas on dogs within 12 hours of application. ... A single application of K9 Advantix^® II remains effective for four weeks. However, if the dog has a severe infestation, re-treatment within a month may be necessary; dogs should not be re-treated more than once every seven days.

Does K9 Advantix really work?

Overall Effectiveness:

With happy, lifelong customers and a thriving place on the market, this product works well. Within 12 hours, you should see your dog stop scratching, as all ticks and fleas should be dead by that time.

How long does it take for K9 Advantix to work?

How long does it take to work on fleas? K9 Advantix II kills fleas within 12 hours. New fleas that jump on the dog from the surroundings, such as grass, carpet and pet bedding, are killed within 2 hours with protection against further infestation for at least 4 weeks.