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Description
K9 Advantix II Flea, Tick & Mosquito Treatment & Prevention for Medium DogsK9 Advantix II Medium Dog is the veterinarian recommended formula that helps defend your dog against five pests: fleas, ticks, mosquitoes, biting flies and lice. And unlike other treatments, K9 Advantix II kills and repels fleas, ticks and mosquitoes. K9 Advantix II topical treatment gets straight to work killing fleas on dogs within 12 hours of initial application. This formula stops existing flea infestations and prevents new ones by killing adult
K9 Advantix II Medium Dog is the veterinarian-recommended formula that helps defend your dog against five pests: fleas, ticks, mosquitoes, biting flies and lice. And unlike other treatments, K9 Advantix II kills and repels fleas, ticks and mosquitoes. K9 Advantix II topical treatment gets straight to work killing fleas on dogs within 12 hours of initial application. This formula stops existing flea infestations and prevents new ones by killing adult fleas on contact so they can’t lay eggs and they don’t have to bite your dog to die. Fleas, ticks, mosquitoes and other pests not only cause discomfort; they may also transmit disease. Monthly use of K9 Advantix II is important to protect your dog against fleas that may cause transmission of tapeworms. This formula also kills fleas which may cause Flea Allergy Dermatitis and flea bite anemia. That’s why K9 Advantix II Medium Dog topical, spot-on formula makes application simple - going on in seconds. It's easier than a flea collar and there are no hard-to-swallow pills. You’ll also love that K9 Advantix II is fragrance-free and waterproof after 24 hours of application. Check the product label for information on application and potential side effects. K9 Advantix II pest protection is effective on both indoor and outdoor dogs. Your dog should be at least 7 weeks old and weigh 11-20 lbs. to use K9 Advantix II Medium Dog. For the ultimate convenience in care, K9 Advantix II is available over the counter – no prescription needed. And, you can stock up with 2-dose, 4-dose and 6-dose packs so you never miss a monthly treatment. Once K9 Advantix II is applied, your dog is ready to get right back to big-pup cuddles and racing around the park. K9 Advantix II Medium Dog is a trademark of Elanco or its affiliates.
Key Features
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K9 Advantix II Medium Dog 30-day treatment & prevention protects dogs 11-20 lbs. from fleas, ticks, mosquitoes, biting flies and lice
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Kills fleas within 12 hours of application
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Vet-recommended formula kills & repels on contact so fleas don’t have to bite your dog to die
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Easy-to-apply topical treatment is fragrance-free and waterproof after 24 hours
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No prescription needed
Directions for Use
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.
Storage Instructions
Store in a cool, dry place inaccessible to children and pets. Protect from freezing.
Active Ingredients
Imidacloprid, Permethrin, Pyriproxyfen
Product Form
- Topical
Pet Size
- Medium
Pet Lifestage
- 7 weeks and older
Pet Weight
11-20 lbs
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 9 reviews
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Product Reviews
★★★★★ 5
Best Shampoo/Conditioner I Have Ever Used
Scent: Nettle, Scent: Nettle
I purchased the Nettle Shampoo in hopes of getting my hair back to health after frying it off with bleach. I used it for the first time today and it is my favorite thing I have ever purchased for my hair. The smell of this is divine. I am not a sweet gourmand fan and this is just the most fresh scent I ever smelt I think. It honestly smells like a high end salon shampoo/conditioner duo. That is my favorite part about this product.
Second favorite is that it actually does work soooo well! I put in quite a bit of oils and hair care before washing my hair and all of those oils were removed without leaving any waxy greasy feel to my hair. I was concerned it wouldn’t come out because this shampoo is 99% lather free. But it worked SO GOOD! It doesn’t feel dried out and brittle either. It’s just perfect I can’t stress it enough. 10/10 I wish there were more way I can say how much I adore this product.
I have very fine hair by the way and it doesn’t weigh it down.
I will keep using this and will update in maybe a month with pictures!
Here’s the update: I used the shampoo and conditioner for idk probably a month. I’m not really sure. BUT I still absolutely love it. In the pictures I am going to attach, you can see that I had a decent amount of growth (the hair from the root that looks gray). My hair is quite oily after other hair care products were added so that’s why it looks the way it does. One more thing, the shampoo is very drying on the scalp I have noticed a little bit of dandruff and itchiness right after washing but I believe my scalp is getting used to it now because it’s getting less and less noticeable after every use. Keep in mind my hair had been chemically treated during the first week of use multiple times including bleach and box dye so that’s probably why it was irritated.
I still absolutely adore the scent and the way it leaves my hair feeling light and clean and shiny and SOFTTT!
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Reviewed in the United States on February 8, 2026
★★★★★ 5
Great product, poorly designed bottles.
Scent: Onion Unscented
I like this product! However, the bottles are heavy, bulky and awkward, what a waste of plastic. The design is poor. The conditioner top was broken, and the product was so thick it was very hard to try and get out of the unyielding bottle when I unscrewed it. Had to ask for a replacement. But it smells great and leaves my hair very soft. I had gotten one for my mother (87) but the bottle was a little much for her, too bad. There's less in it than what it looks like, as it has an inner, smaller container. A lot of trouble and cost to save a small amount of product.
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Reviewed in the United States on June 6, 2026
★★★★★ 4
Great product for damaged bleached hair
Scent: Keratin
Great shampoo and conditioner. Smooths the frizzy ends. I bleach my hair and I am unhappy that this product appears to have washed or altered the toner. I have platinum bleached hair and I put a pale blonde toner on it. I waited 4 days after I bleached and toned my hair to use your product and the end result was yellow hair not that beautiful pale blonde color. I will play around with purple shampoo and your product to see if I can find a happy medium because I do love the silky feeling on my damaged over-processed hair. Thanks for developing such a wonderful product for damaged hair
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Reviewed in the United States on May 15, 2026
★★★★★ 5
Shiny Hair? Yes please
Scent: Onion Unscented
I have used this product just a few times since buying it. It made my hair shiny and smooth. Very minimal frizz. I bought it after doing research on how women helped their hair before all these hair products came out and Onion water was one of the top answers. After believing that I wanted onion smell in my hair, I came across this product and it actually smells SO NICE. After blow drying my hair, my hair was fuller and bouncier. I saw a difference right away. I have seen less hair in my shower drain and I honestly couldn't be happier with this combo.
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Reviewed in the United States on June 1, 2026
★★★★★ 5
Excellent product at a very fair price
Scent: Caffeine
I have been using the caffeine version of this shampoo and conditioner for a little over three months.
I like to give a new shampoo and conditioner about three months before concluding if it’s a hit or a miss.
Originally, I was using the biotin version of this shampoo for approximately two years and was very happy with the results.
I needed to reorder, so I was looking over the other options in this same brand. This brand is considered to be a good quality product. I did do a bit of research before originally purchasing the biotin version.
The biotin version is a lightweight product that did not weigh my hair down with build up over several uses. I ended up needing to use a clarifying shampoo only about once a month, as opposed to once every week.
I have very fine, thin hair and a lot of products I have tried over the years have not worked for me because of the heaviness that leaves my hair flat. I did not have this result with the Bellisso Biotin shampoo.
Bellisso is very well priced, and in my opinion, is comparable to more expensive salon products.
I do like to try new things, so trying a different version of a brand that I was already happy with seemed like it didn’t come with much risk.
Comparing the two versions, biotin vs caffeine:
The biotin option worked very well on my fine, thin hair. The shampoo had a bit of a lower amount of foaming, but it did get my hair clean. The biotin conditioner also worked well, and was easy to rinse out and did not leave a residue on my hair.
The caffeine version is very different than the biotin version, but neither in a good way or a bad way. Just different.
I noticed that much less product of the caffeine shampoo and conditioner is needed to get the job done. The amount of product needed is probably highly dependent on your particular hair, so keep in mind, I probably have less hair than most people.
The shampoo foams ALOT. I didn’t mind this at all. Per the instructions on the bottle, you are supposed to apply and massage your scalp and rinse after 2-3 minutes so the caffeine can be absorbed into your scalp, so having that extra foaming helps. This is meant to stimulate circulation in the scalp, and promote hair growth. If you are the girl that is always in a hurry, this is probably not the version of this shampoo for you :)
The caffeine conditioner goes a very long way, so best to start with half as much as you normally use and go from there.
All in all, I’m happy with both versions and I would definitely consider trying another version of this brand.
I would highly recommend this brand in whichever version suits your personal hair type and needs.
The price is right, as is the quality.
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Reviewed in the United States on May 18, 2026