Are Seresto collars safe for my pet?

This is the most contested question in the category. Verified-purchase reviewers at Walmart, Amazon and Chewy overwhelmingly report effectiveness, and the EPA has stated the product continues to meet its registration standards. However, r/dogs threads (high-trust specialist community) cite news reports linking the collar to thousands of adverse-event reports and pet deaths. Reviewers we read suggest buying only from authorized retailers to avoid counterfeits and watching for skin reactions.