Keep your horse safe and comfortable with Basic Animal Health No Fly Zone Formula No. 1 Horse Spray. This botanical fly spray contains a blend of geranium and peppermint oils to effectively repel insects and provide a refreshing scent. And you’ll like that this spray is made with natural ingredients and is gentle on your horse’s skin. Unlike other sprays that can cause fly immunity or harmful side effects, this formula uses three different essential oil blends to repel insects and support skin comfort. Rotate between the three unique formulas (eash sold separately) to ensure your horse stays protected, as flies never get used to the scent.