There is no expiration date on the Seresto collars. The EPA does not require an expiration date because the product has been proven to have a long shelf life. Seresto has been tested for a 5 year shelf life as long as it is unopened. Once the product package is opened, the shelf life is 8 months.

Do Seresto collars expire if unopened?

No, Seresto collar does not expire as long as kept in its original container and stored in the conditions as directed.

How many months is a Seresto collar good for?

Seresto remains effective following a shampoo treatment, swimming or after exposure to rain or sunlight. Under normal conditions, effectiveness lasts for 8 months. In order to maintain an 8-month duration, dogs must not be bathed more than once a month.