Troy Repel-X 500ml Insecticidal and Repellent Spray stops fleas and flies mid-flight, and prevents attacks from flies, mosquitoes and other biting insects. Troy Repel-X 500ml is suitable for use on dogs as a repellent spray in animal sheds and other places where insects settle to annoy your buddy. The non-toxic repellent is safe to use on dogs and wont cause any harm to yourself or your buddy, but will aid in getting the annoying bugs away. Spray directly onto your dog and the repellent starts working straight away against flies, mosquitoes and other annoying biting insects.