The Seresto collar for large dogs (those over 18 pounds) is generally considered effective for keeping fleas and ticks at bay for up to eight months. But like with anything, there are some things to keep in mind that might affect how well it works. According to the manufacturer and our research, most dogs do get nearly the full eight months of protection, which is pretty solid.

A great thing about this collar is that it's water-resistant, so it should hold up through rain, sunlight, and the occasional bath or swim. Just be aware, if your dog is a frequent swimmer, the collar's effectiveness might drop off a bit earlier—like five months for fleas and seven for ticks.

Keep in mind that not everyone has the same success with these collars. Some folks notice that it doesn’t seem to work as long as expected. This can happen if it's not fitted right or if it's exposed to water constantly. There are also fake collars out there, so make sure you’re buying from a reliable source.

Also, watch out for any irritation or allergic reactions. Every dog is different, so keep an eye on any changes after you put the collar on.

If you're not getting the protection you expected, check the collar’s fit, how much it's been exposed to the elements, or whether it's a genuine product.

Overall, using the collar properly and buying from a trustworthy place will give you the best chance of making it work. It's generally got a good track record, but everyone's experience can be a bit different.

The Seresto flea collar is pretty well-regarded for being easy to use and getting the job done. One of the nice things about it is that it's water-resistant, so you don't have to mess with taking it off for baths or if your dog loves swimming. According to the manufacturer's description, it even stands up to rain and sun, which is handy if you're looking for continuous protection.

But if your dog is a regular in the water, there's a bit of a catch. The collar is supposed to last up to 8 months for fleas and ticks, but this might shorten a bit with lots of water—maybe down to 5 months for fleas and 7 months for ticks.

Our research shows mixed feedback when it comes to the collar's effectiveness with lots of water exposure. Some folks have found it works fine through occasional baths or swims, aligning with the manufacturer’s suggestion to not bathe your dog more than once a month for best results.

Others have noticed it doesn't work as well if their pooch is always wet or if they use non-recommended shampoos. So, if your dog is a water enthusiast, keep an eye on how well it's doing.

About safety, we haven’t come across any major red flags as long as you use the collar as directed. Still, it's always good to watch out for any weird reactions, especially when you first put it on your dog. If your dog's had trouble with flea treatments before or is sensitive, it might be worth checking in with your vet just to be safe.

Overall, for dogs that aren't constantly getting wet, the Seresto collar seems like a straightforward way to fend off fleas and ticks. Just remember it might not last as long if your dog is a swimmer, and always follow any advice your vet gives you. That should help keep your pup protected smoothly.

The Seresto Large Dog Flea & Tick Collar is supposed to keep fleas and ticks away for up to 8 months, at least according to the manufacturer. It's a convenient way to help protect your dog from those annoying pests. However, how long it actually lasts can vary.

The manufacturer's description mentions that the collar is water-resistant, which is great if your dog loves swimming or needs frequent baths. That said, if your pup is a regular swimmer or gets more than one bath a month, you might see the protection last around 5 months for fleas and about 7 months for ticks. So, if your dog spends a lot of time in the water, the collar might not last the full 8 months.

From what we've gathered, there are mixed feelings about the collar's effectiveness. Many dog owners say it works for the full 8 months, but some notice it doesn't work as well after a few months, especially if their dog swims a lot. To get the best results, make sure to stick to the care instructions.

If you're finding it doesn't last as long as hoped, consider checking things like how often your dog's getting wet. And if you're still having trouble with fleas or ticks before the 8 months are up, it might be worth chatting with your vet to see if anything else could be affecting the collar's performance.

Overall, the Seresto collar usually does its job for up to 8 months, but keeping tabs on your dog’s activities and sticking to the guidelines can help.

Always watch for any signs of fleas or ticks and talk to your vet if you're worried about your dog's health or the collar's effectiveness.