Animal Repellents Spray on areas where pets and strays don't belong including lawns, flowerbeds, garden beds, trees, shrubs and trash containers. Masks scents familiar to animals, causing them to become uneasy, and thus repelling them. Effective for a week or more, may be re-applied less frequently once animal behavior has changed. Their favorites become areas to avoid, not visit. And don't worry, the spray is made from all natural plant oils, so it's friendly to family, animals, and plants.