14. Flea Collars with Organophosphates
Older-style flea collars containing organophosphates are a major concern for veterinarians. These chemicals can cause neurological problems, skin reactions, and even poisoning in pets and children. Thankfully, there are safer, modern flea prevention options that don’t carry the same risks. Always check the ingredients before purchasing flea collars and consult your vet for recommendations. For more details, see the EPA Flea Collar Warning.