Report: Popular flea & tick collar tied to 1,700 pet deaths, EPA received more than 75,000 complaints Post author By Post date March 7, 2021 An investigation found that more than 75,000 complaints about the Seresto brand of flea and tick collars have been sent to the EPA. Investigators have linked the deaths of nearly 1,700 dogs and cats, according to reporting. Read MoreTweetRelated