In short: the bottles are intended to discourage animals from choosing certain spots to urinate.
Myth vs. Reality
Despite how common this practice has become, there’s no scientific evidence that it works. Animal behaviorists agree that dogs and cats are not reliably deterred by water bottles. The method seems to be more of a folklore solution—a low-cost, harmless attempt at prevention. While it may give homeowners peace of mind, it rarely provides actual protection against pets marking walls.
More Effective Alternatives
If your goal is truly to keep pets away from your walls, consider these proven strategies:
Clean up immediately: Rinse or spray the area with water or a mild, pet-safe cleaner to remove scents that encourage repeat marking.
Use repellents: Pet-safe sprays or gels can consistently discourage marking.
