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Kara from Snellville, Ga writes

Does the Seresto Dog Flea and Tick Collar have an expiration date if not opened?

Answer:

The Seresto Dog Flea and Tick Collar does not have an expiration date as long as it has remained in its original container and stored in cool/room temperature conditions.  Once the collar has been opened placed on your animal, it will last 8 months according to the manufacturer. You may contact Bayer Animal Health at 800-255-6517 for more questions on their product. 

Answer last updated on: 03/18/2016

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