I don't know how to potty a guinea pig but I have found that my piglets mostly use a corner for pooping and urinating. I bought this and put in the angle they used most of the time, can't say it's 100% effective. I still have scattered granules in the cage but they use that to urinate and that has a lot of granules too. I empty it every other day, wash and dry it before putting it back. I am very satisfied with this product. Mkono Potty Trainer Corner Litter Box for Hamster Guinea Pig Ferret Gerbil Chinchilla (Random Color)
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