I have a 3 pound woolly rabbit and it is too small. I use wood pellets in animal litter and barely put them on the bottom of the tray before putting the lid on and it fills up so quickly that a tiny rabbit droppings wouldn't otherwise get into the holes to reach the bottom tray. You would literally have to reset it twice a day. This may work for a very small guinea pig, but not for a medium-sized one. So maybe for a child.
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