Vet's Best Mosquito Repellent Spray (8 oz) uses a unique blend of Lemongrass Oil and Geraniol Oil (from Citronella plants) to safely repel mosquitoes. Formula is deet free. Our formulas are independently tested and proven effective at repelling mosquitoes. Can be used directly on dogs and cats 12 weeks or older and people 2 years or older. For over 30 years, Vet?s Best has blended plant-based ingredients that work together to comfort and protect your pet. Our products are a plant-based alternative to traditional chemicals and can be used year-round. For added Mosquito protection, try Vet's Best Flea and Tick Yard & Kennel Spray that kills mosquitoes in outdoor spaces.