Four Thieves Vinegar: A Natural Pest Repellent for Dogs and Cats Our Four Thieves Vinegar, made in France 🇫🇷, is a powerful natural repellent against ticks and fleas. It is a mix of ingeniously selected and measured plants, macerated in apple cider vinegar. The vinegar contains no essential oils, making it suitable for epileptic dogs and cats. This combination creates a formidable armor against parasites. Indeed! Parasites are repelled by its smell and feel attacked by the molecules present in the plants. As a result, they refrain from clinging to your pet's fur.