It is not effective?
Even though the Seresto Dog Flea and Tick Collar continues to work for 8 months, it is not a complete repellent during that time. Fleas and ticks will still need to bite to consume the active ingredient, so it can take several hours for them to die. Be sure that you are still checking outdoors and treating as needed so that the dog is not bringing fleas and ticks indoors. Please take a moment to review our Flea Treatment Guide for more tips and information on eradicating this pest.
Answer last updated on: 12/23/2020