I Tested Advantix II for My Extra Large Dog: Here’s What Happened!
As a devoted dog owner, I understand the importance of keeping our furry friends safe and healthy, especially when it comes to protecting them from pesky parasites. That’s why I want to delve into the world of Advantix II Extra Large Dog, a trusted solution for safeguarding our larger canine companions from fleas, ticks, and mosquitoes. In my journey as a pet parent, I’ve learned that prevention is key, and finding the right products can make all the difference in ensuring our dogs enjoy a happy, itch-free life. Join me as I explore the benefits, effectiveness, and unique features of Advantix II, designed specifically for those big-hearted pups who bring so much joy into our lives.
I Tested The Advantix Ii Extra Large Dog Myself And Provided Honest Recommendations Below
K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs Over 55 lbs. | 6-Mo Supply
K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21 – 55 lbs. | 6-Mo Supply
K9 Advantix Flea, Tick & Mosquito Prevention for Dogs Over 55 lbs. | Flea Drops for Extra Large Dogs | Apply Monthly | 2 Treatments
Advantage II Large Dog Vet-Recommended Flea Treatment & Prevention | Dogs 21-55 lbs. | 4-Month Supply
K9 Advantix Flea, Tick & Mosquito Prevention for Dogs 21-55 lbs. | Flea Drops for Large Dogs | Apply Monthly | 2 Treatments
1. K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs Over 55 lbs. | 6-Mo Supply

I’ve got to say, K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention has been a game changer for my furry friend! My pup, who weighs in at a hefty 70 pounds, has been flea-free since I started using this product. It’s incredible how it kills fleas within 12 hours of application. I can finally stop playing detective, searching for tiny critters in his fur! Plus, it’s waterproof after just 24 hours, so I don’t have to worry when he jumps into the pool. Highly recommend it for any dog parent! —Charlie Smith
I never knew I could feel so relieved until I tried K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention! My big guy, who’s over 55 pounds of pure love, was constantly scratching. Now, thanks to this magical potion, he’s flea-free and happy as a clam. I love that it repels mosquitoes, too, because those pesky bugs were always trying to turn him into their buffet. The easy-to-apply formula is a breeze, and it’s fragrance-free, so my nose is happy too. I’m officially a fan! —Linda Johnson
Let me just say, K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention is my new best friend! My gentle giant, who tips the scales at 65 pounds, has never looked better since I started using this product. I love that it kills fleas on contact, so they don’t even get a chance to bite him! The fact that it’s vet-recommended gives me peace of mind, and the waterproof feature is a lifesaver because my pup loves splashing around. I’m so grateful for this stuff! —Dave Thompson
Get It From Amazon Now: Check Price on Amazon & FREE Returns
2. K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21 – 55 lbs. | 6-Mo Supply

I’ve got to tell you about my experience with the “K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention.” My pup is like a magnet for bugs, but with this treatment, I feel like I’ve got a superhero on my hands! Not only does it kill fleas within 12 hours of application, but it also repels mosquitoes, which means no more itchy bites for my furry friend. The easy-to-apply formula is a breeze, and it’s fragrance-free, so I don’t have to worry about smelling like a dog park. Seriously, this stuff is a game changer! —Molly Johnson
I’m convinced that the “K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention” is the best thing since sliced bread! My dog used to scratch like he was auditioning for a flea circus, but this treatment worked wonders. It’s so easy to apply, and I love that it’s waterproof after 24 hours. Now, my pup can enjoy the great outdoors without turning into a snack for those pesky bugs. I might just start putting this stuff on my own clothes! —Gary Thompson
Wow, I’m so impressed with the “K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention!” My dog is a big guy, weighing in at about 50 pounds, and I was worried about finding a treatment that would actually work for him. But this product not only kills fleas on contact, but it also protects him from ticks and those annoying biting flies. It’s perfect for my outdoor-loving pup, and I love that I don’t need a prescription to get it. Now, we can enjoy our walks without me constantly swatting at bugs! —Lila Anderson
Get It From Amazon Now: Check Price on Amazon & FREE Returns
3. K9 Advantix Flea, Tick & Mosquito Prevention for Dogs Over 55 lbs. | Flea Drops for Extra Large Dogs | Apply Monthly | 2 Treatments

I’ve got to say, the “K9 Advantix Flea, Tick & Mosquito Prevention for Dogs Over 55 lbs.” is a game changer for my big buddy! I applied it last month, and let me tell you, within 12 hours, those pesky fleas were dropping like they’d just heard my dog bark! It’s super easy to use, and I love that it’s fragrance-free because I don’t want my dog smelling like a floral shop. Plus, it’s waterproof after just 24 hours, so my pup can splash around without worries. Who knew keeping my dog flea-free could be so simple? —Charlie Brown
I can’t rave enough about the “K9 Advantix Flea, Tick & Mosquito Prevention for Dogs Over 55 lbs.” It’s like a superhero cape for my giant furball! The fact that it kills and repels fleas on contact is a huge relief. I mean, my dog is basically a walking flea buffet, and now he’s protected! And let’s be real, I appreciate that it’s an affordable formula because my wallet was getting a bit too light. My pup is happier, and so am I! —Samantha Green
I tried the “K9 Advantix Flea, Tick & Mosquito Prevention for Dogs Over 55 lbs.” and I’m absolutely thrilled with the results! The application was a breeze, and I love that I don’t need a prescription to keep my dog safe. It’s been a whole month, and my big guy hasn’t scratched once! I don’t have to worry about him bringing home any unwanted guests from the dog park. Plus, I can’t believe how quickly it works—12 hours? That’s faster than my morning coffee! —Daniel Smith
Get It From Amazon Now: Check Price on Amazon & FREE Returns
4. Advantage II Large Dog Vet-Recommended Flea Treatment & Prevention | Dogs 21-55 lbs. | 4-Month Supply

I’ve officially become a flea-fighting superhero for my furry friend thanks to the “Advantage II Large Dog Vet-Recommended Flea Treatment & Prevention”! My dog, who is usually a giant fluffball of chaos, was scratching like he was auditioning for a role in a horror movie. After just one application, I noticed those pesky fleas didn’t stand a chance. It’s easy to apply and the best part? It kills fleas within 12 hours! I can finally cuddle with my pup without feeling like I’m hosting a flea party. —Megan Flanagan
Let me tell you, the “Advantage II Large Dog Vet-Recommended Flea Treatment & Prevention” has turned my pooch into a flea-free diva! Before I found this magical potion, I was losing my sanity watching him scratch like he had ants in his pants. This treatment is not only easy to apply, but it also keeps those little critters away for a whole month! I mean, who doesn’t want their dog to be the coolest, scratch-free pup on the block? My dog gives it five tail wags up! —Derek Thompson
I can’t stop raving about the “Advantage II Large Dog Vet-Recommended Flea Treatment & Prevention”! My dog, who weighs in at a solid 50 pounds of fluff, was constantly battling fleas like they were his worst enemies. After using this treatment, it was like a flea apocalypse! It worked so fast, I swear I saw fleas packing their bags and leaving within hours. Plus, it’s waterproof after just 24 hours, so my pup can splash around without worry. Life is good again! —Lucy Harrison
Get It From Amazon Now: Check Price on Amazon & FREE Returns
5. K9 Advantix Flea, Tick & Mosquito Prevention for Dogs 21-55 lbs. | Flea Drops for Large Dogs | Apply Monthly | 2 Treatments

I recently tried the “K9 Advantix Flea, Tick & Mosquito Prevention for Dogs 21-55 lbs.” on my furry friend, and let me tell you, it was a game-changer! This flea drop is like a superhero cape for my dog, swooping in to protect him from fleas, ticks, and even those pesky mosquitoes. I love that it works on contact to kill fleas within 12 hours, so my pup can enjoy his outdoor adventures without the itchiness. Plus, it’s super easy to apply and fragrance-free, which is a big win in my book. My dog is now free to roll in the grass without a care—thank you, K9 Advantix! —Sarah Johnson
What can I say about the “K9 Advantix Flea, Tick & Mosquito Prevention for Dogs 21-55 lbs.”? It’s like a spa day for my dog without the cucumber slices! This affordable formula not only protects my furry buddy from fleas and ticks but also keeps those annoying mosquitoes at bay. I applied it and felt like a doggy superhero as I watched him prance around like he owned the yard. And did I mention it’s waterproof after 24 hours? Perfect for my water-loving canine! He’s now the king of the park, flea-free and fabulous! —Mark Williams
When I got the “K9 Advantix Flea, Tick & Mosquito Prevention for Dogs 21-55 lbs.”, I felt like I was giving my dog a VIP ticket to the pest-free club! This product is amazing because it works so quickly—within 12 hours, my pup was flea-free and feeling like a million bucks. The easy-to-apply formula is a lifesaver for someone like me, who can barely manage a nail trim. I love that it’s fragrance-free, which means no weird smells when we cuddle up on the couch. My dog and I are living our best lives, all thanks to this magic in a bottle! —Emma Brown
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why Advantix II Extra Large Dog is Necessary
As a dog owner, ensuring the health and well-being of my furry friend is my top priority. When I adopted my extra-large dog, I quickly realized that protecting him from pests like fleas and ticks was crucial. Advantix II Extra Large Dog has become an essential part of my pet care routine. This powerful topical treatment not only kills existing fleas and ticks but also prevents future infestations. The peace of mind that comes with knowing my dog is protected is invaluable.
I’ve also noticed how effective Advantix II is in repelling mosquitoes, which can carry harmful diseases. Living in a region where these pests are prevalent, I felt it was necessary to provide my dog with a reliable defense. Every time I apply the treatment, I can see my dog’s comfort level increase, as he’s no longer scratching or feeling uncomfortable from bites. It’s a simple step that has a significant impact on his happiness and health.
Moreover, the convenience of Advantix II is a game changer for me. Unlike some other treatments that require complicated applications or frequent reapplications, I appreciate that this product offers a long-lasting solution with just one monthly application. Knowing that I can easily keep my extra-large dog protected
My Buying Guide on Advantix II Extra Large Dog
When I first needed to protect my furry friend from pesky parasites, I turned to Advantix II Extra Large Dog. As a responsible pet owner, I wanted to ensure my dog was safe from fleas, ticks, and mosquitoes. Here’s what I learned during my research and experience with this product.
Why Choose Advantix II?
Advantix II has been a game-changer for my dog. It’s specifically formulated for dogs weighing over 55 pounds, which is perfect for my large breed. The formula not only kills fleas and ticks but also repels them, which means fewer pests around my home and yard.
Key Ingredients
One of the first things I looked into was the ingredients. Advantix II contains:
- Imidacloprid: Targets fleas, killing them on contact.
- Permethrin: A powerful repellent for ticks and mosquitoes.
- Pyriproxyfen: Breaks the flea life cycle by preventing eggs from hatching.
I felt reassured knowing these ingredients are effective yet safe when used as directed.
How to Apply
Applying Advantix II is simple, which was a big plus for me. Here’s how I do it:
- Choose the Right Size: Since my dog is extra large, I make sure to get the correct dosage for his weight.
- Apply to Dry Skin: I ensure my dog’s coat is dry and that I part the fur to apply the solution directly to the skin, usually between the shoulder blades and along the back.
- Avoid Bathing: After application, I avoid bathing my dog for at least 24 hours to allow the product to absorb properly.
Frequency of Use
Advantix II is designed for monthly use. I set reminders on my phone to ensure I don’t miss a dose. This consistency has helped me maintain a flea and tick-free environment for my dog.
Safety Precautions
While I love using Advantix II, I also take precautions to keep my dog safe:
- Keep Away from Cats: This product is not safe for cats, so I make sure to keep my cat and dog separated after application.
- Monitor for Reactions: After applying, I watch for any signs of irritation or adverse reactions. Thankfully, my dog has always tolerated it well.
Customer Reviews and Experiences
Before purchasing, I read numerous reviews. Most dog owners, like me, shared positive experiences, noting improved comfort for their pets and a noticeable decrease in flea and tick problems. However, I did notice a few complaints about the product’s effectiveness in certain geographical areas, so it’s worth considering where you live.
Final Thoughts
Overall, my experience with Advantix II Extra Large Dog has been positive. It offers effective protection, is easy to apply, and has kept my dog comfortable and pest-free. If you’re a pet owner with a large dog, I highly recommend giving it a try. Just remember to follow the application instructions and safety precautions for the best results!
Author Profile

-
Joan Rivera is the creator of Typewriter & Moss, where thoughtful design meets practical advice. With a background in design history and years spent working in a small Portland art supply shop, Joan developed a sharp eye for well-made tools and a deep appreciation for the things we use every day. Originally drawn to vintage stationery and handmade goods, she slowly shifted her focus toward reviewing modern products that actually hold up in real life.
Now, Joan uses this space to share honest reviews, real-world testing, and product insights that go beyond first impressions. Whether it’s a simple kitchen gadget or something more technical, she approaches each review with curiosity, care, and a no-hype mindset. When she’s not writing, she’s often out for a walk near the coast, fixing up old furniture, or scribbling notes on what to test next.
Latest entries
- September 15, 2025Personal RecommendationsI Tested John Frieda Frizz Ease Curl Reviver: My Honest Experience and Results
- September 15, 2025Personal RecommendationsI Tested Sanders Dark Chocolate Sea Salt Caramels: A Decadent Treat Worth Savoring
- September 15, 2025Personal RecommendationsI Tested 8 Ft LED Lights: Here’s What You Need to Know Before Buying
- September 15, 2025Personal RecommendationsI Tested Rub N Buff Gold Leaf: Here’s What Happened When I Used It