The Earth Animal Flea and Tick Prevention Collar for Large Dogs is a natural and effective way to protect your furry friend from fleas and ticks. This collar is specifically designed for large dogs and is made with a special blend of lemongrass, peppermint, and other natural ingredients. It does not contain any DEET, chemical pesticides, or insecticides, making it a safe choice for your pet. Earth Animal has been developing all-natural products since 1979, and their organic herbal remedies are carefully selected to naturally assist pets in battling common ailments. Please note that this collar is not intended for use on cats.