The Ardap Spoton as Flea and Tick been tested by me on my little Chinese Crested dog PP. My dog weighs 3.7 kg and has got the Spoton in the neck. Side effects or adverse reactions did not exist, but unfortunately, despite the Spotons within four weeks casting time we had 4 ticks. So did not have the desired effect and therefore can not recommend it. Too bad, I thought to have found a chemical-free protection.