This dome is a pretty good product when it comes to containing the granules, however, my youngest and my oldest cats like to jump out even when the dome is on. It is a great product for keeping the granules contained, however, it leaves only one place for the cats to track the granules and that is in front on the mat. The mat is another review. I wish CatGenie would make like a plexiglass cover to try and prevent even more granules from escaping, especially with 2 very active cats that I have. The plexiglass or plastic cover would go inside the dome to where the cat can easily push it to go in and out of the unit while keeping the granules inside.