Over a period of up to 8 months, these active ingredients are released in low concentrations onto your pet's skin and hair, which are then distributed over the entire. As the title says (seresto collar not working), we bought it about 2 weeks ago i think, popped it onto the cat as soon as it arrived, we've also used a spot on called itch, (previously tired advocate and stronghold) seresto says the collar started working 30 minutes after applying and lasts up to 8 months at £34 you'll expect it to work :) we've been fighting fleas for nearly a year now, i. How To Use Seresto For Cats - Hd - Youtube This lead researchers concluded that if it worked on kittens, then it would be even more useful for canines. Do seresto flea collars work for cats . Though this collar works best for the cats and most vets recommend t for the cats , but in some special cases, it can be used on your dog too. A flea collar is simply a collar that you put around your cat’s neck that is use...