Popular flea collar linked to almost 1,700 pet deaths. The EPA has issued no warning.

Seresto, one of the most popular flea and tick collars in the country, has been linked to hundreds of pet deaths, tens of thousands of injured animals and hundreds of harmed humans, U.S. Environmental Protection Agency documents show.

Yet the EPA has done nothing to inform the public of the risks.

New report criticizes EPA pesticide registration process

The Environmental Protection Agency has registered more than 16,000 pesticides. However, a large portion of those are only "conditionally registered," meaning they lack important data on health safety and environmental well-being. A report by the Government Accountability Office recently criticized the process behind registering such pesticides.