K9 Advantix II for Medium Dogs (11-20 lbs) Teal Box

Monthly Topical Flea, Tick & Mosquito Protection

Product Description

K9 Advantix II for Medium Dogs provides broad-spectrum, waterproof protection against fleas, ticks, mosquitoes, biting flies, and lice through contact-kill action without painful biting. This once-monthly topical treatment combines imidacloprid, permethrin, and pyriproxyfen to kill all flea life stages, prevent re-infestation, and provide four weeks of continuous protection.

Benefits

• Contact Kill: Eliminates parasites on contact without requiring bites or feeding.
• Broad Spectrum: Controls fleas, ticks, mosquitoes, biting flies, and lice effectively.
• Flea Lifecycle: Kills all flea stages, including eggs, larvae, and adults, completely.
• Waterproof Formula: Maintains effectiveness after bathing, swimming, or rain exposure.
• Four-Week Protection: A Single application provides continuous defense for a full month.

Ingredients 

Active Ingredients

Imidacloprid, Permethrin, and Pyriproxyfen.

Inactive Ingredients

Propylene glycol, benzyl alcohol, polyethylene glycol, and other inert ingredients. 

Guaranteed Analysis  

Note: cis/trans ratio – Maximum 55% (±) cis and Minimum 45% (±) trans.

Variants

How to Use

Dosage & Administration Instructions

• Weight Verification: Confirm the dog weighs between 21 and 55 lbs for the large dog formulation.
• Tube Preparation: Cut pouch, remove tube, peel foil, twist cap to break seal.
• Application: Part fur from shoulders to tail base, apply directly to skin.
• Distribution: Squeeze contents in 3-4 spots to prevent run-off from a single location.
• Monthly Schedule: Reapply every four weeks for continuous year-round protection.

Additional Information

Precautions

• Age Restriction: This product is intended for dogs and puppies seven weeks or older. 
• Species Warning: Never apply this treatment to cats, as permethrin is highly toxic and potentially fatal to them.
• Child Safety: Keep all children away from the treated area until it has completely dried and is safe.
• Skin Sensitivity: Monitor your dog’s skin for irritation and consult a veterinarian if reactions continue beyond three days.
• Aquatic Toxicity: Prevent dogs from entering lakes, rivers, or other surface water for at least forty-eight hours after application. 

Possible Side Effects

• Skin Irritation: Some dogs may experience redness, scratching, or mild discomfort at the area where applied.
• Gastrointestinal Upset: In rare cases, dogs might show vomiting, diarrhea, or other digestive disturbances after application.
• Lethargy: Occasionally, dogs may display temporary reduced energy, tiredness, or lack of usual activity after treatment. 

Shipping & Return

We offer ground, express, priority, and international delivery; see our shipping policy for details.

For return instructions or product concerns, please refer to our detailed refund policy.

Frequently Asked Questions

Q1: How quickly does K9 Advantix II start killing fleas and ticks after application?

Ans: K9 Advantix II begins killing adult fleas within twelve hours of application and continues working for four full weeks. The contact-kill action means parasites die upon contact with treated fur, preventing biting and reducing disease transmission risk throughout the protection period.

Q2: Can my dog swim or bathe after applying K9 Advantix II?

Ans: Yes, K9 Advantix II features a waterproof formula that maintains effectiveness after bathing, swimming, or rain exposure. The treatment bonds to skin oils and hair follicles, providing consistent protection even with regular water activities throughout the month.

Q3: Is K9 Advantix II safe to use on dogs with sensitive skin?

Ans: K9 Advantix II may not be suitable for dogs with sensitive skin conditions. While generally safe, some dogs may experience localized irritation, including redness or scratching. Consult your veterinarian before use if your dog has known skin sensitivities or allergies.

Q4: What precautions should I take when applying K9 Advantix II around cats?

Ans: Keep cats away from treated dogs for at least 24 hours after application. Permethrin is extremely toxic to cats and can be fatal if cats contact treated areas before the product dries completely on the dog's fur.

Q5: Why am I seeing more fleas after treating my dog with K9 Advantix II?

Ans: Seeing more fleas initially is normal as dying fleas rise to the coat surface and become more visible. Environmental fleas may continue jumping on your dog for up to 30 days until the complete flea lifecycle is broken in your home.