K9 Advantix II Large Dog Flea, Tick & Mosquito Treatment 21–55 lbs — 2-Month Spot-On, Waterproof

K9 Advantix II Large Dog is a once-monthly topical treatment that kills and repels fleas, ticks, mosquitoes, biting flies and lice for dogs 21–55 lbs. K9 Advantix II Large Dog offers a veterinarian-recommended, easy-to-apply spot-on formula designed for monthly use. The treatment begins working quickly and is formulated to both kill and repel several common external pests that bother dogs. It’s fragrance-free, becomes waterproof after 24 hours, and is available over the counter so you can treat your dog without a prescription.

How fast does this product start protecting my dog?

After the first application, K9 Advantix II begins killing fleas within 12 hours and continues to protect against new infestations for a full month. Because it kills on contact and repels pests, treated fleas don’t need to bite to be affected. Continued monthly use helps break the flea life cycle in your home and yard.

• Flea kills often noted within 12 hours of application
• Monthly dosing maintains ongoing protection
• Kills and repels so pests don’t have to bite to be affected

Is it safe and simple to apply?

Application is quick: part the hair between the shoulder blades and apply the liquid directly to the skin. The spot-on drops dry rapidly so dogs can resume normal activity shortly after treatment. Always read the product label for detailed directions and any cautions before use.

• Topical, spot-on applicator for straightforward monthly dosing
• Fragrance-free formula that dries quickly
• Waterproof after 24 hours to maintain effectiveness

Which pests does this treatment cover?

K9 Advantix II targets multiple external pests: fleas, ticks, mosquitoes, biting flies and lice. It both repels and kills several of these pests on contact, reducing the need for them to bite your dog in order to be affected. That broader spectrum helps protect dogs that spend time indoors and outdoors.

• Controls fleas and flea reinfestation on dogs
• Repels and kills ticks and mosquitoes
• Also effective against biting flies and lice

Will this work for my dog’s age and weight?

This specific K9 Advantix II Large Dog formula is labeled for dogs weighing 21–55 pounds and at least 7 weeks old. Choose the proper pack size to maintain monthly dosing without gaps. If your dog falls outside this weight range, select the corresponding size product.

• Recommended for dogs 21–55 lbs and 7+ weeks old
• Available in multi-dose packs for 2, 4 or 6 months of coverage
• Over-the-counter — no prescription required

Who is this for K9 Advantix II Large Dog is aimed at dog owners who want a veterinarian-recommended, monthly topical solution to address multiple external pests without the hassle of pills or a collar. It suits active pets that go indoors and outdoors and owners who prefer an over-the-counter option that dries quickly and becomes water-resistant. Always inspect the product label for application steps, safety information and potential side effects, and consult your veterinarian with any specific health questions about your pet.

Ingredients

Imidacloprid, Permethrin, Pyriproxyfen

FAQ

Q: How often should I apply K9 Advantix II Large Dog?

A: Apply once every 30 days. Keep up monthly use to maintain continuous protection against fleas and ticks.

Q: Can puppies use this formula?

A: This Large Dog formula is for dogs 7 weeks or older weighing 21–55 lbs. Use a size appropriate for smaller puppies.