Bob Martin Double Action Spot On CatBob Martin Double Action Spot On is a vet-strength flea killing treatment available without prescription!It is the only treatment that can be used on both dogs and cats and contains the same active ingredient as Advantage. More than just a repellent, it kills fleas that are on your pet AND those about your home!Effective and gentle - Each treatment will protect your pet for up to 4 weeks. The specially developed double action formula:1. Kills fleas on contact. Read more… Kills fleas before they can lay eggs - breaking the flea lifecycle. 2. Kills flea larvae in the pet's immediate surroundings, e. g. bedding or favourite resting areas, preventing re-infestation. Please ensure that you use the correct Bob Martin Spot On product specifically designed to your animal. Always read the packs carefully before use.