Not at all. The tub is really too flat to be knocked over. It’s 28 inches long, and 18 inches wide. And about 7 inches tall. So it can’t be knocked over. If 7 inches is too high, get some strong scissors or tin snips, and cut a lower lip. I’ve cut up some large Tupperware containers. I like the cement mixing tub because it cost $8 at Lowes. But any large Tupperware would work too – they just cost more than $8. A dollar store would have some good options too. My buns have not shown a preference to the height. So I haven’t cut this one down. It’s the litterbox bedding that they are draws them, the corner placement, and the containment. Not necessarily the height. My buns don’t dig the pop out… If yours does, Then I wouldn’t cut the lip down. Perhaps experiment with a few different types of boxes. Find some cheapies at a dollar store that are tall, and then cut out a door. Maybe use a cheap storage bin and cut an access hole? That will keep the flying poop in! I used a storage bin while my Guin stayed outside in the bird aviary. I dug a large hole in the ground, buried the storage box, and laid a corrugated tunnel for access. I had meant it for a den to get out of the summer heat (geothermal cooling) but she thought it made a better litter box.