K9 AdvantixII Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 2-Mo Supply

We have fought fleas on all fronts in our hot and muggy rural area. Frontline and the generic version- useless. Sprayed the land, treated our home, sprayed our dog with an additional temporary spray. This is the first time we've ever had such problems. Dog was constantly scratching, visible fleas and flea dirt. Flea comb simply full of mature fleas and flea dirt. Two vet visits in which we were told the next step was a yearly and expensive treatment. Thankfully, found this on Google as vet recommended. Bought a dose here.It arrived yesterday and we immediately applied as directed to 15 lb dog. He was fine upon application. No major problems afterwards but did began to claw himself aggressively and nip at his paws. Found those relatively minor results on the carton safety data and saw no reason to be overly concerned. I did give him the dose of antihistamine as prescribed by our vet. I think the fleas were 'abandoning ship'! He became drowsy within about 40 minutes settled down and slept soundly all night. No raw spots or other problems today but he looks like a newer, improved dog today. He is basically white. Today there were no visible fleas or flea dirt. Yes! So glad we found this product, all I will buy again! Great customer support because I called the # on the product box today just to check his reaction. They were great.

For ten years, K9 Advantix II Medium Dog has been my go-to flea and tick preventative. My dog has remained completely pest-free, even in a high-risk area, demonstrating its consistent effectiveness month after month. Crucially, he has experienced absolutely no side effects – no irritation, no changes in behavior, just a happy, healthy pup. The application is simple. I highly recommend K9 Advantix II for reliable, long-term protection and peace of mind.

This product is effective when the puppy/dog does get fleas. After applying, in a matter of days all fleas are completely gone. As it is a chemical and chemicals have potential risks to both the animal and humans, I only use it when fleas are present vs. a monthly preventative/maintenance on the advice of my vet.

Flea control on your furry babies is no joking matter. The struggle is real! I've tried so many different kinds of flea control that one is as bad as the other. I went to my local PetSmart and went directly to the flea prevention professional, the store manager. I asked her which flea prevention medicine she would use on her pets, and she went straight to K9 Advantix. So, it's go time. I purchased the K9 Advantix and had my fingers double-crossed for extra luck on the flea fiasco. I've used it a few times, and it does work at the beginning of the cycle, but doesn't make it to the end of the 4 weeks as advertised. I will say that it is easy to apply and my dogs seem agreeable to the application, I just wish it would last a few more weeks longer because flea control is very costly, especially when you have 3 dogs.

Works every time. This is our go-to flea control now. It's much more affordable than what they sell at the vet, and does just as good a job.

Works great for our 4 dogs - 2 chihuahua mixes and 2 lab mixes. Zero fleas and any ticks are dead on them.

I felt it was my responsibility to inform pet owners of possible side effects associated with Bayer Advantix II. I purchased this to use on my always healthy and energetic 7 yr. old Lhasa Apso. Approximately 2 hours after application he started showing signs of lethargy and in general refusing to walk. When he did walk he only took one or two steps and then immediately sat down and started scratching or biting his tail and/or the application points. He had never displayed these symptoms before and has always been extremely active, running, barking and doing his guard dog thing.I took him to the vet the next morning. She couldn't find anything specific and said that although it would be unlikely, it could be a reaction to the Advantix since it had been applied only hours before symptoms appeared. She said to watch closely and let her know if the symptoms did not go away.In the meantime I called Bayer's pet health line. The person I spoke to immediately recognized the symptoms and said that it was because of an adverse reaction by my dog to the permethrin used in Advantix, used to repels mosquitoes. It leads to something called paraesthesia which was described as a tingling or pricking (pins and needles) caused chiefly by pressure on or damage to peripheral nerves. Since the Bayer representative knew immediately the symptoms, it sounded like this is a somewhat common problem. I was told that the condition is only temporary and should go away in 24-72 hrs. She said that the pins and needles effect was so irritation that the dogs typically will not walk to prevent this pain or irritation.I was told that the best treatment was to remove the Advantix by giving the dog a bath with Dawn dish detergent. I was told that I could also apply some Vitamin E oil to the application points to relieve irritation.It has now been approximately 36 hrs since the bath with Dawn to remove the Advantix and my dog is still not back to normal. He seems to feel alright and will eat and drink, but he refuses to walk more than a few steps at a time without scratching and then just sitting down. I have had to carry him around so as not to aggravate the situation. Normally he is very active and runs constantly. We have also had to cancel our daily walks of 2 to 3 miles a day. I am closely monitoring his condition and if it doesn't improve by the 72 hr deadline given by Bayer, I'm going to have to take him back to the vet for further treatment. I also gave him a second bath with Dawn just in case I missed some of the Advantix the first time.I realize that there are possible side effects with any product or medication, however since the Bayer representative immediately knew exactly what I was talking about when I described my dogs symptoms, I feel that this problem is possibly more widespread than reported. I know many people use and swear by K9 Advantix II but after what I have seen I definitely do not recommend it. There are also other flea medications that contain permethrin and I would also advise against them also. I have always used Frontline in the past and have had no problems with it. Frontline does not contain permethrin.

Considering how much I paid for this, I expected it to actually work. It's not great. They only had a few fleas, to begin with, but they were irritating them, and jumping on me, so I thought it best, to get some kind of treatment.They're still scratching (especially my older, smaller dog), and i had fleas jumping on me, this morning.I applied it, two days ago!Would not recommend, considering the price. It's not really worth it.