Mosquito coils, electric mosquito repellent liquid, and electric mosquito repellent pads contain a component called "pyrethroids," which are relatively safe for humans and dogs but highly toxic to cats. Safer methods are physical mosquito repellents. Use mosquito repellent lamps, electric mosquito swatters, and other physical methods for mosquito control. Additionally, you can plant mosquito-repellent plants such as lemongrass and mint.