The EPA internally raised concerns about Seresto flea collar for years, new records reveal

Even as it assured the public of its safety, the U.S. Environmental Protection Agency privately raised concerns for at least six years about the disproportionate number of incidents of harm and death linked to the popular Seresto flea and tick collar, newly released government documents show.

As early as 2015, the EPA said that Seresto’s incident count “ranked #1 by a wide margin” compared to other pet flea and tick products. Three years later, the agency recognized that it would receive reports of 50-100 pet deaths related to Seresto every three months with a “trend of increasing numbers.”