I have four cats and two dogs who have a penchant for "disrupting" the litter box. I have one large cat who needs plenty of headroom so this is perfect for him. I put the litter box, extra litter, a covered container to place the used litter into, a water dish for the cat who washes her paws after using the litter box and still have plenty of room for the cats to move around. I nailed a wooden bar across the front of the door to keep the dogs out but high enough for the cats to go under. Everyone is happy. 

Pros: Super easy assemble. Not too big so it fits in my mudroom. Smells good.
Cons: The wood is very soft.