photo credit: me and the sysop

Natural Resources Defense Council analysis reveals that some pet flea collars can create toxic chemical residues on pet fur that threaten human health.

“In new scientific analysis also released today, NRDC found high levels of propoxur and tetrachlorvinphos (TCVP), another carcinogenic neurotoxin common in household pet products, on pet fur after use of ordinary flea collars. NRDC is also petitioning the Environmental Protection Agency (EPA), calling for the removal of these chemicals from pet products.”

Their Green Paws website has guides on what to avoid.