Industrial-Sized Deals Best Books of the Month Shop Women's Handbags Learn more nav_sap_plcc_6M_fly_beacon Beach House Storm Fire TV Stick Off to College Essentials Find the Best Purina Pro Plan for Your Pet Shop Popular Services Home Theater Setup Plumbing Services Assembly Services Shop all tmnt tmnt tmnt  Amazon Echo Fire HD Kids Edition Kindle Voyage The Walking Dead\ Shop Back to School with Amazon Back to School with Amazon Outdoor Recreation Deal of the Day

K9 Advantix II Flea Control for Dogs 21-55 Pounds (6 Applications)
Size: 6 applicationsColor: 21-55 LbsChange
Price:$73.99+Free shipping with Amazon Prime
Your rating(Clear)Rate this item


There was a problem filtering reviews right now. Please try again later.

286 of 317 people found the following review helpful
on July 27, 2007
I tried Advantix (as opposed to Advantage) for the first time recently and immediately noticed that my dog was having a strong reaction to it. She stayed up all night panting heavily and periodically would run in circles. I checked the package insert and it said nothing about possible adverse reactions, and the product website also failed to warn of potential problems. However, I read on a vet's site that Advantix, unlike Advantage, is known to cause a variety of side effects, including hyper-activity, which was obviously what was going on with my dog. This site said not to use the product again in the event of a bad reaction. Not only was I unhappy with the product, but was upset that Bayer didn't bother to list possible side effects. Very irresponsible. I won't use any of their pet products again.
105105 commentsWas this review helpful to you?YesNoSending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
65 of 73 people found the following review helpful
on August 21, 2007
I would never have applied this product to my dog if I had known what it would do. I applied it as directed, and everywhere it touched her skin is inflamed and red, her whole body is hot and she is in agony, twitching and whimpering. She keeps trying to scratch her back and cannot sleep or relax. I am waiting for a return call from the vet now. Please do not use this product, I feel horrible because I was just trying to help her and I will never forgive myself if she dies. Once I realized there was a problem, I immeadiately washed her with dishsoap but it didn't help. I will say that my other two dogs are just fine after application, but it isn't worth the chance.
77 commentsWas this review helpful to you?YesNoSending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
27 of 28 people found the following review helpful
on December 25, 2010
Used K9 Advantix believing it to be top of the line. After one dose, my dog became extremely hyper - kept running in circles. He'd stare blankly and started crying. He started to vomit, bright red blood was coming from his rectum. He was bouncing off walls, running into objects, moaning strangely, and got very paranoid. He had a very difficult time breathing, rising body temperature and, lastly, lost the use of his hind legs as he was dragging them behind him in total panic. All of these symptoms manifest within 4 hours. We called our vet who wanted to see him immediately. They were prepared with IV meds, took blood tests, ordered x-rays and used scanning equipment because they HAD treated this before. Outcome was not promising. After two days in the hospital, we brought our baby home. What was the cause? Bayer's K9 Advantix - the medication with the highest concentrate of Permethrin. Our dog had succumb to Permethrin Poisoning. More common than you know. I've run the gamut of every agency I knew, filed reports and complaints, but this appears to be a very hush-hush deal. I asked my vet, who has treated other dogs with similar reactions to Permethrin in K9 Advantix, exactly what he has seen for symptoms and outcomes. He replied everything from organ failure to permanent paralysis to death. My vet's office does not recommend K9 Advantix to any pet owner as they've seen, first hand, the pain and suffering a dose of K9 Advantix can have on a pet. Don't kid yourself, you can use K9 Advantix for a year with absolutely no side effects, but it takes just one time for your pet to react adversely and have to go through what we did. Permethrin is a very potent poison used to kill hearty weeds. Bottom line, Bayer produces a "medication" that contains high levels of a toxic poison. Does anyone see how "sick" this situation is???? There is an on-line blog called [...]where you can read through 15 pages of actual testimonials from pet owners who have had to deal with the complications caused by Bayer's K9 Advantix. I pray you don't ever experience what our family did, nor any of the families who have lost their precious pets to K9 Advantix - God Bless you All!
22 commentsWas this review helpful to you?YesNoSending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
90 of 103 people found the following review helpful
on November 25, 2004
K9 Advantix works great on my dog. He is a little more active than most and likes to run around in the rain, so the medication doesn't always last a whole month for him. It lasts about two and a half to three weeks if it's raining a lot. It does kill every flea that touches him. Another thing I like about this product is the repelling ability. It kills whatever is on my dog, and keeps new bugs away. I use K9 Advantix every month, and my dog stays happy. Remember: You get what you pay for, and your dog won't be happy if you're using the cheap brands under $10. You might as well throw your money away, because fleas are immune to the lesser-brand medications now.

Also, I'm glad to see Amazon selling this MUCH cheaper than other stores. I went all over the internet looking for cheap meds for my dog. Then I thought, I'll check out Amazon, they sell everything. Shop around, you'll see.
11 commentWas this review helpful to you?YesNoSending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
48 of 53 people found the following review helpful
on June 22, 2009
On Sunday I put Advantix as directed between the shoulder blades of my 8 year old Chocolate Lab and Cairn Terrier. My Cairn had no reaction. My Lab did. The following day, she was lethargic, and I washed her, to try to remove the product from her skin. Tuesday morning she vomitted and would not move, she looked stoned and we took her to an animal hospital. They treated her for a reaction and her symptoms. Oxygen mask, I.V., etc... By the end of the day she was having seizures and was moved to an overnight facility to be under watch. Her situation worsened and by mid-day on Wednesday she had passed away. I must note she was an indoor dog, not subject to chemicals, a healthy weight, great demeanor, and has not ever had medical problems. Within 72 hours she went from a lively, 8 year old lab, playing in the backyard with my son, to passing away. The only difference in her life was the K9 advantix.
22 commentsWas this review helpful to you?YesNoSending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
141 of 164 people found the following review helpful
on April 29, 2008
Although I have used Advantage safely for years, Bayer has added a toxic pesticide Permethrin, to it's formula to market the once flea only product for ticks also...The very same Permethrin sold over the counter as Bio-Spot your vet will tell you is unsafe....Do a google on Advantix toxic, Permethrin toxic & see the results....My Min-Pin started showing signs of neurologicalproblems the very next day...I regret applying at night before going to bed as I could not do a thing the net day...I tried washing the product off 3 times with soapy Dawn, but it was too late....He became confused, lethargic, spaced out without ability to focus...later couldn't even go out to pee...He died 3 days after application.....Bayer denied any of the symptoms exhisted before & said it must have been something else...The dog was in good health, & never left the house after application ....The neurological symptoms came within hours of application...I MISS My "Little Man"....Permethrine IS POISON for your yard...read the warnings...My dog died from this product advantix...don't believe the marketing & advertising HYPE by Bayer....it's all for money at the expense of sme pets reactions....do the research BEFORE!!
3535 commentsWas this review helpful to you?YesNoSending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
45 of 51 people found the following review helpful
on October 15, 2009
I have read the reviews and know that K9 Advantix works for many peoples' pets. However, be very careful when using this brand of flea control. I have been using Frontline Plus and had no problems with it, but K9 Advantix advertised that it killed and repelled more insects so I thought I would try it on my 12 pound Shih-Poo. What a mistake! Within the first 24 hours of using this product, the application site became very red and my dog was scratching like crazy. I gave him a bath in oatmeal shampoo to remove any K9 Advantix residue and to try to relieve some of the itchiness. It gave my dog some relief but later that day I noticed that the area was still red and the skin had started to flake, peel and bleed. I immediately rushed him to my vet and was told that the K9 Advantix had given my dog a skin infection. He was put on an antibiotic, an antihistamine, and Benadryl at night to help him sleep and keep him from scratching all night long. I'm happy to say that the medications are working and his skin color is now back to normal. I read another review where a similar situation happened to the owner of Shih-Tzu. I don't know whether K9 Advantix has an adverse reaction only on certain breeds, but I'd be very careful using this product, especially on small dogs.
11 commentWas this review helpful to you?YesNoSending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
54 of 63 people found the following review helpful
on October 23, 2007
My dog almost died from this product from the ingredient Permethrin. Within 8 hour of applying the correct amount to my dog he was crying and hallucinating pulling his hair out.His body was twitching, and his back legs would not move. I immediately washed him with Dawn detergent, but this still did not help. I took him to the vet and they started injections of atropine the antidote for Permethrin, and was hospitlized.He is now experiencing kidney problems,and fluid in the lungs from this.My vet bill has reached $823.21 and it's still not over.My vet refuses to carry this product it's deadly for some pets.
66 commentsWas this review helpful to you?YesNoSending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
19 of 20 people found the following review helpful
on August 8, 2006
I have 3 dogs and have been using Advantix for about 3 years. I used to use Revolution, but at the time lived in a woody area of South Carolina, where ticks plentiful and are a year-round problem. My dogs would have 5-10 ticks on them everyday. I switched to Advantix, and then would rarely find a tick. Never any fleas, and since it repels mosquitos too, the dogs & I are much happier...no scratching from bites. I now live in FLA, and wouldn't use anything else. If you are switching from Revolution you will have to add Heartworm treatment, which is now available in a generic monthly chew, at a very reasonable price. The price here on Amazon is very competitive with other online pet supply sellers.
0CommentWas this review helpful to you?YesNoSending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
19 of 20 people found the following review helpful
on June 12, 2006
I can't tell you if this product works or not because my dog is having a bad reaction after only applying it. They don't mention anything about side effects, yet, I've found many stories on the internet of bad reactions. My 4 year old pug hasn't been the same since I applied it. Shes not being herself, shes walking weird and she keeps scratching her back. I will never use this product again.
0CommentWas this review helpful to you?YesNoSending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse

Questions? Get fast answers from reviewers

Please make sure that you've entered a valid question. You can edit your question or post anyway.
Please enter a question.
See all 6 answered questions


Send us feedback

How can we make Amazon Customer Reviews better for you?
Let us know here.