Bests & Worsts Reviews from Amazon

I was sent a counterfeit product which was verified as a counterfeit by Bayer, the manufacturer of Sereto. The packaging and collar look exactly like the authentic one. The only way to know if you received a counterfeit product is to call Bayer directly. You will need all the packing material which is the can and the plastic wrap. These items have codes that Bayer can use to determine the authenticity of the collar. I purchased this collar because the previous one I ordered did not last 8 months. After 6 months my dog had a tick on his back so I immediately reordered another collar and put it on him in December. When I was inspecting the can I noticed the 01-2017 date and thought it was expired. I then called Bayer and they confirmed that I received a counterfeit product. I did not save the previous can so I'm not sure if that one was also defective but I assume it was since it did not last the full 8 months. I received a full refund of the product after I reported the issue.