When it comes to my pets, I’ll admit I’m picky, and I want something that actually works without making them sick. Fleas, ticks, and mosquitoes are a nightmare where I live, so I decided to give K9 Advantix II a try after hearing other dog owners swear by it. But is it really as effective and safe as it claims? Here’s my full experience.
What Is K9 Advantix II?
K9 Advantix II is a topical flea, tick, and mosquito treatment for dogs. It’s applied monthly and claims to not just kill but also repel pests before they bite. Unlike some competitors, it covers a wide spectrum: fleas (all life stages), ticks, mosquitoes, lice, and biting flies. It’s available in different weight-specific doses (from small to extra-large dogs). Prices usually range between $55–$75 for a 4-dose pack or around $120–$150 for a 6-dose pack, depending on the store.
Why I Bought It
I had tried cheaper flea collars and shampoos in the past, but they barely scratched the surface. My dog still scratched like crazy, and I was constantly worried about ticks during our walks. I wanted something that was easy to apply, long-lasting, and reliable, which is why I went for K9 Advantix II after reading about its broad protection.
My Experience Using It
The first time I applied it, I was a bit nervous, as topical treatments can sometimes cause irritation. Thankfully, my dog handled it well. The instructions were simple: part the fur and squeeze the tube between the shoulder blades. Within a day or two, I noticed a real difference… the scratching stopped, and I didn’t spot a single flea or tick for weeks.
What I loved most was the peace of mind on walks. My dog could roll in the grass or explore the woods without me panicking about ticks. Another bonus? It also repels mosquitoes, which is huge since we live in a mosquito-heavy area.
That said, there were a few frustrations. It leaves an oily patch on the fur for a day or two after application (so no cuddling right away). And if your dog loves swimming, you’ll need to be careful, as frequent baths or swims can reduce its effectiveness. Plus, it has a strong chemical smell at first.
Overall, though, the convenience and effectiveness outweighed those small drawbacks for me.
Pros and Cons
Pros:
- Kills and repels fleas, ticks, lice, mosquitoes, and biting flies
- Starts working within 12–24 hours
- Easy once-a-month application
- Multiple weight-specific doses
- Prevents flea reinfestation by targeting all life stages
Cons:
- Leaves a greasy spot for a day or two
- Strong chemical smell on application
- Pricey compared to basic flea collars/shampoos
- Can cause mild irritation in sensitive dogs
- Reduced effectiveness if dogs swim or are bathed too often
Is It a Scam?
No… K9 Advantix II is a legitimate and well-established product from Bayer/Elanco. It’s widely used by vets and pet owners and has been on the market for years. The negative reports usually come down to individual dog sensitivity, misuse (like bathing too soon), or extremely heavy flea/tick environments where no single product is perfect.
Alternatives
- Frontline Plus
- NexGard
- Seresto Collar
- Bravecto
Conclusion: Would I Recommend It?
Yes, I would recommend K9 Advantix II, especially if you live in an area with heavy flea, tick, or mosquito activity. It’s one of the few treatments that truly covers repelling as well as killing pests, and my dog has been noticeably more comfortable since I started using it.
It’s not perfect (the greasy spot and chemical smell are annoying), but for me, the trade-off is worth it. If your dog swims a lot or has sensitive skin, you might prefer an oral alternative like NexGard or Bravecto, but for broad coverage, K9 Advantix II remains one of the most reliable options I’ve tried.
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