--- product_id: 70637694 title: "VetOne - CrossBlock II™ Kills & Prevents Fleas on Cats (Over 8 Weeks Old) | Waterproof to Last Long | Ensures 3 Months of Protection (9lbs+)" brand: "vet one" price: "€ 0.99" currency: EUR in_stock: false reviews_count: 8 url: https://www.desertcart.hr/products/70637694-vetone-crossblock-ii-kills-and-prevents-fleas-on-cats-over store_origin: HR region: Croatia --- # VetOne - CrossBlock II™ Kills & Prevents Fleas on Cats (Over 8 Weeks Old) | Waterproof to Last Long | Ensures 3 Months of Protection (9lbs+) **Brand:** vet one **Price:** € 0.99 **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** VetOne - CrossBlock II™ Kills & Prevents Fleas on Cats (Over 8 Weeks Old) | Waterproof to Last Long | Ensures 3 Months of Protection (9lbs+) by vet one - **How much does it cost?** € 0.99 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/70637694-vetone-crossblock-ii-kills-and-prevents-fleas-on-cats-over) ## Best For - vet one enthusiasts ## Why This Product - Trusted vet one brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Product description CrossBlock II is a topical flea treatment for cats that kills adult fleas as well as their eggs and larvae. It contains imidacloprid and pyriproxyfen, and starts working within 2 hours, providing a full month of protection. CrossBlock also prevents re-infestation of fleas by stopping fleas from reproducing. The waterproof formula comes in easy-to-open, individual dose applicators. When to Use Use monthly to treat and prevent flea infestation on cats and kittens 8 weeks of age and older. It is possible pre-existing pupae in the environment may continue to emerge for 6 weeks or longer depending on climatic conditions. Use CrossBlock II For Cats & Kittens monthly for the control and prevention of flea re-infestations. Directions The cat should be standing or in a comfortable position for easy application. Apply the entire contents of the applicator evenly to three spots along the cat’s back, from the shoulder to the base of the tail. At each spot, part the hair down to the level of the skin and gently squeeze the applicator to apply the product. Avoid superficial application to the cat’s hair. Do not apply an excessive amount of solution to any one spot. This could cause the product to run off the cat. Do not get the product in the cat’s eyes or mouth or allow your cat to ingest the product. Discard the empty applicator. If empty, place in trash or offer for recycling, if available. If partly filled, call your local solid waste agency for disposal instructions. Never place unused product down any indoor or outdoor drain. Repeat every month, or as recommended by your veterinarian. Precautions For external use on cats and kittens 8 weeks of age and older. Do not use on dogs. If there are multiple pets in close proximity, keep them separated until the area where Crossblock II was administered has dried to avoid contamination by licking. Contains Active ingredients: Imidacloprid 9.10% and Pyriproxyfen 0.46%. Review: Excellent mid-priced product - For our cats, I put this on the same level of effectiveness as the much more expensive Advantage products, which we have tried extensively. I appreciate the lower price-point here & I plan to purchase more. The past few years in the Midwest have been ATROCIOUS for fleas & we've been at war with the beasts in our home during prime flea season, & this product definitely helped keep them at bay during late summer/early fall. Application is easy & not messy at all if done properly. Be certain to get as much as possible directly on the skin not the fur. Also be sure it's on the upper neck/back of the head area, as there is a good amount of liquid in these applicators & excess may be prone to run. We haven't seen but maybe a stray (but clearly struggling) flea or 2 on our kitties since application a couple weeks ago & they barely itch at all anymore. This makes everyone very happy. No this product is not as cheap as PetArmor, which we have also tried extensively, but it does the job MUCH better comparatively. Fyi our war on fleas was finally victorious after a multi-faceted approach involving 2 house-wide sprinklings of food-grade DE, which I left on for about a week, then swept, vacuumed & mopped up. But the huge table turner was the house-wide application of a Precor 2000 Plus aerosol spray, which includes both an instant flea killer & a long-term growth inhibitor, & it also dried pretty quickly as an added bonus. All of this combined w/ regular vacuuming & the use of this product on our kitties allowed us to get our particular situation completely under control. In short, highly recommend this mid-point cost alternative to much more expensive brands. Review: Works better than Revolution and Front line Plus - We were using generic Frontline plus on our cats. It did not work very well and the cats tried hard to resist having them dosed. We switched to Crossblock II and one of our cats gives us no problems when we dose him. The other doesn't like being held much so she puts up some resistance but not nearly as hard as she used to. It seems that the other medicine's smell is what set off the cats to resist. After changing to this product, we noticed no unpleasant smell, and we thing that's what the cats mostly objected to. A year ago we had a bad flea infestation. I used a combination of an insecticide and insect growth regulator (IGR) that exterminators use and did 2 treatments to the house. We switched to Crossblock shortly after that and have not had any flea problem. We've even forgot to dosed the two cats we have and did it about 2 weeks late twice. The cats did not scratch, so there were no fleas. Our cats are on the borderline weight range so we get the over 9 pound dose package. This stuff works very well and I don't see any reason to change. We see no ill effects on either cat, no area of irritation at the dosing site, nothing negative at all. This generic of Advantage II also takes care of heartworm and intestinal worms in cats, though I don't believe they can advertise that in the US. Donald If you find this review helpful, please click on the YES button below. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B06X9YB8HS | | Age Range (Description) | Kittens | | Age Range Description | Kittens | | Best Sellers Rank | #451,503 in Pet Supplies ( See Top 100 in Pet Supplies ) #159 in Cat Flea Drops | | Brand | Vet One | | Brand Name | Vet One | | Customer Reviews | 4.2 out of 5 stars 885 Reviews | | Item Volume | 0.08 Fluid Ounces | | Manufacturer | MWI | | Scent | Unscented | | Scent Name | Unscented | | Target Species | Cat, Dog | | UPC | 313985014154 | | Volume | 0.08 Fluid Ounces | ## Product Details - **Brand:** Vet One - **Scent:** Unscented - **Item Volume:** 0.08 Fluid Ounces - **Age Range (Description):** Kittens - **UPC:** 313985014154 ## Images ![VetOne - CrossBlock II™ Kills & Prevents Fleas on Cats (Over 8 Weeks Old) | Waterproof to Last Long | Ensures 3 Months of Protection (9lbs+) - Image 1](https://m.media-amazon.com/images/I/71Frd80SbOL.jpg) ![VetOne - CrossBlock II™ Kills & Prevents Fleas on Cats (Over 8 Weeks Old) | Waterproof to Last Long | Ensures 3 Months of Protection (9lbs+) - Image 2](https://m.media-amazon.com/images/I/81K56x65DEL.jpg) ![VetOne - CrossBlock II™ Kills & Prevents Fleas on Cats (Over 8 Weeks Old) | Waterproof to Last Long | Ensures 3 Months of Protection (9lbs+) - Image 3](https://m.media-amazon.com/images/I/7173UtQMTYL.jpg) ![VetOne - CrossBlock II™ Kills & Prevents Fleas on Cats (Over 8 Weeks Old) | Waterproof to Last Long | Ensures 3 Months of Protection (9lbs+) - Image 4](https://m.media-amazon.com/images/I/71nbVtPOD4L.jpg) ![VetOne - CrossBlock II™ Kills & Prevents Fleas on Cats (Over 8 Weeks Old) | Waterproof to Last Long | Ensures 3 Months of Protection (9lbs+) - Image 5](https://m.media-amazon.com/images/I/81XoJneV-WL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Excellent mid-priced product *by M***N on October 1, 2018* For our cats, I put this on the same level of effectiveness as the much more expensive Advantage products, which we have tried extensively. I appreciate the lower price-point here & I plan to purchase more. The past few years in the Midwest have been ATROCIOUS for fleas & we've been at war with the beasts in our home during prime flea season, & this product definitely helped keep them at bay during late summer/early fall. Application is easy & not messy at all if done properly. Be certain to get as much as possible directly on the skin not the fur. Also be sure it's on the upper neck/back of the head area, as there is a good amount of liquid in these applicators & excess may be prone to run. We haven't seen but maybe a stray (but clearly struggling) flea or 2 on our kitties since application a couple weeks ago & they barely itch at all anymore. This makes everyone very happy. No this product is not as cheap as PetArmor, which we have also tried extensively, but it does the job MUCH better comparatively. Fyi our war on fleas was finally victorious after a multi-faceted approach involving 2 house-wide sprinklings of food-grade DE, which I left on for about a week, then swept, vacuumed & mopped up. But the huge table turner was the house-wide application of a Precor 2000 Plus aerosol spray, which includes both an instant flea killer & a long-term growth inhibitor, & it also dried pretty quickly as an added bonus. All of this combined w/ regular vacuuming & the use of this product on our kitties allowed us to get our particular situation completely under control. In short, highly recommend this mid-point cost alternative to much more expensive brands. ### ⭐⭐⭐⭐⭐ Works better than Revolution and Front line Plus *by T***W on August 29, 2018* We were using generic Frontline plus on our cats. It did not work very well and the cats tried hard to resist having them dosed. We switched to Crossblock II and one of our cats gives us no problems when we dose him. The other doesn't like being held much so she puts up some resistance but not nearly as hard as she used to. It seems that the other medicine's smell is what set off the cats to resist. After changing to this product, we noticed no unpleasant smell, and we thing that's what the cats mostly objected to. A year ago we had a bad flea infestation. I used a combination of an insecticide and insect growth regulator (IGR) that exterminators use and did 2 treatments to the house. We switched to Crossblock shortly after that and have not had any flea problem. We've even forgot to dosed the two cats we have and did it about 2 weeks late twice. The cats did not scratch, so there were no fleas. Our cats are on the borderline weight range so we get the over 9 pound dose package. This stuff works very well and I don't see any reason to change. We see no ill effects on either cat, no area of irritation at the dosing site, nothing negative at all. This generic of Advantage II also takes care of heartworm and intestinal worms in cats, though I don't believe they can advertise that in the US. Donald If you find this review helpful, please click on the YES button below. ### ⭐⭐⭐⭐ I'd buy again *by T***K on October 13, 2019* It appears to work, although I use it as a preventative rather than as a treatment. I reapplied at 3 weeks because she seemed itchy but still it's a good value for under $5 a dose. Kitty doesn't get a bald spot like with some treatments and she doesn't appear to hate me for a day afterward (I think some others burn!) so I'll definitely use it again. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/70637694-vetone-crossblock-ii-kills-and-prevents-fleas-on-cats-over](https://www.desertcart.hr/products/70637694-vetone-crossblock-ii-kills-and-prevents-fleas-on-cats-over) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-22*