Beaphar Fly Guard is an easy-to-use and affordable veterinary strength spray that provides up to three months of protection against blow fly strike on rabbits and guinea pigs. It contains ivermectin, and is suitable for animals aged 10 weeks and older. For optimal results, make sure to clean and remove any faeces from your pet before use and follow the directions for the correct dose for your pet's weight. Additionally, maintaining good hutch hygiene is key to preventing blow fly strike, so ensure to remove all soiled bedding once a week, and more frequently during warmer months.