Petco Text Logo
Petco Pet Logo

K9 Advantix II Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention for Large Dogs, Count of 6

K9 Advantix II Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention for Large Dogs, Count of 6

Count: 
12
6
4
2
1
Icon carat down

Description

K9 Advantix II Large Dog delivers vet-recommended treatment and prevention of five pests, including fleas, ticks, mosquitoes, biting flies and lice. Within 12 hours of application, K9 Advantix II Large Dog repels pests and kills fleas on contact so they don't have to bite your dog to die. This monthly, easy-to-apply topical formula is fragrance-free, waterproof after 24 hours and there's no prescription needed.

  • - K9 Advantix II Large Dog 30-day treatment & prevention protects dogs 21-55 lbs. from fleas, ticks, mosquitoes, biting flies and lice
  • - Kills fleas within 12 hours of application
  • - Vet-recommended formula kills & repels on contact so fleas don't have to bite your dog to die
  • - Easy-to-apply topical treatment is fragrance-free and waterproof after 24 hours
  • - No prescription needed

Please note that the product information displayed is provided by manufacturers, suppliers and other third parties and is not independently verified by Petco.

Specifications

SKU2254952
Primary BrandK9 Advantix II
Days to ShipShips Next Business Day
Weight.15 LB
Personalized Item flagNo
Breed SizeLarge
Length1.375 IN
Height6.625 IN
Width4.375 IN

Use only on dogs. DO NOT USE ON CATS or other animals. Do not apply to dogs weighing less than 4 lbs.Remove applicator tube from the package. Use scissors and peel down foil.Hold applicator tube in an upright position. Pull cap off tube.Turn cap around and place other end of cap back on tube.Twist cap to break seal, then remove cap from tube.The dog should be standing for easy application. Evenly apply entire contents of the tube along the top of the dog's back, from the shoulder down to the base of the tail. The number of spots depends on the size and weight of your dog (please refer to the product label). At each spot, part the hair until skin is visible. Place the tip of the tube on the skin and gently squeeze to expel a portion of the solution on the skin. Do not apply an excessive amount of solution at any one spot that could cause some of the solution to run off the side of the dog. Do not get this product in your dog's eyes, or allow your dog to ingest this product.

Description

K9 Advantix II Large Dog delivers vet-recommended treatment and prevention of five pests, including fleas, ticks, mosquitoes, biting flies and lice. Within 12 hours of application, K9 Advantix II Large Dog repels pests and kills fleas on contact so they don't have to bite your dog to die. This monthly, easy-to-apply topical formula is fragrance-free, waterproof after 24 hours and there's no prescription needed.

  • - K9 Advantix II Large Dog 30-day treatment & prevention protects dogs 21-55 lbs. from fleas, ticks, mosquitoes, biting flies and lice
  • - Kills fleas within 12 hours of application
  • - Vet-recommended formula kills & repels on contact so fleas don't have to bite your dog to die
  • - Easy-to-apply topical treatment is fragrance-free and waterproof after 24 hours
  • - No prescription needed

Please note that the product information displayed is provided by manufacturers, suppliers and other third parties and is not independently verified by Petco.

Specifications

SKU2254952
Primary BrandK9 Advantix II
Days to ShipShips Next Business Day
Weight.15 LB

Reviews

Rating Snapshot

Select a row below to filter reviews.

5 stars

5336

4 stars

774

3 stars

198

2 stars

141

1 stars

472

Overall Rating

4.5
4466 out of 4984 (90%) reviewers recommend this product

Review this Product

Adding a review will require a valid email for verification
Customers say

Customers overwhelmingly praise this flea and tick treatment for its exceptional effectiveness, with most reporting complete elimination of infestations and zero parasites after switching. Many highlight decades of consistent success, particularly in high-risk wooded areas, and frequently compare it favorably to other brands, noting superior speed and longevity. Reviewers also appreciate the added mosquito protection and stress-free application process. A small number report ineffectiveness or allergic reactions, but these concerns are vastly outweighed by the strong consensus that this is a reliable, go-to solution trusted for years.

Most Helpful Favorable Review

(No title)

vet_tech

20 years ago

I am a vet tech who was involved in getting the final stage of FDA approval for ...

Show Full Review

811 PEOPLE FOUND THIS HELPFUL

Show Reviews:

5

and

4

Most Helpful Critical Review

Absolutely Useless

Patricia2

10 years ago

I bought a 2-pack of Advantix II for my rat terrier six weeks ago. She did not h...

Show Full Review

170 PEOPLE FOUND THIS HELPFUL

Show Reviews:

3

2

and

1

Customer Images

Filter Reviews

1 - 8 of 5470 Reviews

1451 Ratings-Only Reviews

Worked for my 3 dogs.

Craigrad

14 days ago
I found fleas on my three dogs on a Sunday. I heard that topical treatments were not effective but I could not get a prescription on a Sunday and wanted to give my dogs some relief ASAP so I tried this. It worked. I checked the dogs 8 hours after applying and could not find any fleas. I'm impressed. I still got some oral prescription meds later to help with any remaining fleas that I cannot see.

Yes, I recommend this product.

Helpful?
Response from petco.com:
10 days ago
Customer Care
Hi Craig, thank you for sharing your experience! We’re glad this helped bring some quick relief when you needed it most. We love helping pet parents care for their pets with confidence. Wishing your pups continued comfort and many happy days ahead!

Negative reaction Chiweenies

Unhappy Dogs after Trying

2 months ago
Dogs had a very negative reaction and had to rush them to the vet after giving them several baths to stop this from irritating their skin. I normally used oral flea and tick medicine so if was definitely from applying this to their skin after reading the directions. Highly do not recommend this product.

No, I do not recommend this product.

Helpful?
Response from petco.com:
2 months ago
Customer Care
We are incredibly sorry to hear about your pets' situation. Your experience is taken very seriously, and we want to investigate further. When you have a moment, reach out at petco.com/contact-us so our team can assist.

Do Not Buy

Meli

2 months ago
This product does not work my dog still had flees even after using it. Definitely not worth the money.

No, I do not recommend this product.

Helpful?
Response from petco.com:
2 months ago
Customer Care
We regret that this did not work as hoped. Please get in touch with us at petco.com/contact-us so we can help resolve this.

Topical treatment that works

StephanieJ

4 months ago
[This review was collected as part of a promotion.] K9 Advantix II is a trusted brand of flea, tick and mosquito preventative for dogs. I've used this medicine for years with various members of my furbaby family. There's no odor to the solution, and it's very simple to apply monthly. This medicine is a great value compared to the cost of the prescription brands sold by your vet.

Originally posted on elanco

Hello Mother Hello Father Fleas Ticks Mosquitoes Really Bother!

AlexandraM

4 months ago
My dog stays healthy with K9 Advantix. The application goes on smooth and absorbs easily into my dog’s fur. He has stayed healthy and tick free just how we like it!!

Originally posted on influenster.com

Beware allergic reaction

Keno RIP

4 months ago
My dog started having g seizures within 6 hours of topical application. 3 trips to the vet and couldn’t get under control. My Keno passed away 4 days later.

No, I do not recommend this product.

Helpful?
Response from petco.com:
4 months ago
Customer Care
We are truly sorry to hear about the loss of your pet. Our hearts go out to you during this difficult time. Please get in touch with us at petco.com/contact-us, so we can look into this right away.

Best flea and tick prevention

AlondraC

4 months ago
I love this product, it’s very easy to use. My dogs are outside most of the time on they play time and daily walks and they are always clean and protected. I doesn’t irritate my dog’s skin, I think it’s fabulous.

Originally posted on influenster.com

Not very effective if you see fleas on your dog.

HeatherJ

5 months ago
[This review was collected as part of a promotion.] I was not too impressed with the effectiveness of the product. I had seen a few fleas on my dog and I couldn’t tell that the product helped much if any with removal, so duration and durability was not very good. I couldn’t tell that it had any scent. Application was very simple.

Originally posted on elanco

1 - 8 of 5470 Reviews

Questions

1 - 10 of 96 Questions

should I bathe my dog before applying

  1. Yes! I bathe my dog before application.just make sure his fur is fully dry before you apply it!



Does it kill/ repel tapeworm ?

    I applied K9 Advantix II for small dogs (4 - 10lbs) to my toy poodle. He's oatmeal color fur. After the application, we noticed his fur on his back where the three spot applications were, turned grayish brown in a strip. What to do with the discoloration?

    1. Give your dog a bath no less than 24 hours after application. The stripe will go away and they'll still be protected. For the medication to be effective, they can't get wet for 24 hours application. The topical does pick up dirt and fuzz, but after you bathe them it will be gone.



    I have a 50 lb pit bull. Looking for good flea protection. He scratches often. Would advantix work?

    1. Advantix also repels pests.  Most flea treatments only kill fleas when they bite.  So Advantix may work for your dog. 



    What is the mm in large vs extra lg?

    1. XL: 4.0mL (0.135 fl. oz.) L:   2.5mL (0.84 fl. oz.)



    how many ml contain a dose for medium dogs?

      My dog weighs 150 lbs. how much do I need to use?

        Wts better advantage or advantix

        1. Advantix



        Hello my dog is 11.3 pounds should I use the small or medium one?

        1. Simple, don't use it. Use vectra instead



        I am looking something against the mosquitoes, we live in a hot, humid place and my dog is old, he doesn´t move a lot so the mosquitoes are a nightmare! This product works well for this problem??

        1. yes me and my 2 pups we go hiking alot in the woods the mosquitos will float around the pups ive been using this flea meds for 10 years never had a problem with fleas ticks and mosquitos i always wash the pups wait till next day and apply k9 advantix 2



        Related Articles & Questions