I have a 17-year-old cat her name is Rowdy she never let any cat share her litter box. So needless to say she won, all the other cats we’ve ever had have been outdoor barn cats until last year, we got a kitten. Rowdy surprisingly had no issues with another cat peeing in the litter box. I have used cat spot for a couple years now I have to say I love it no questions. It’s light weight. It’s economically friendly. It’s environmentally safe because it’s 100% natural. There is no litter box smell what so ever. I will be forever a cat spot subscriber.