Only Natural Pet EasyDefense Flea & Tick Dog Collar All-natural flea & tick collar designed by scientists and tested and approved by vets to give your cat a safe and effective alternative to dangerous, chemical flea collars Long lasting, water resistant protection for up to 3 Full Months! Safe, powerful combination of non-toxic ingredients, including Geraniol, along with citronella, citronella oil, and cinnamon oil Completely safe for your dog with no harmful chemicals or pesticides Only Natural Pet brand products are 100% Guaranteed!