I have fostered guinea pigs before, and one of the most challenging parts of their care is cleaning up after them. They’re adorable little critters, but they’re also very messy and they constantly poop. So, a guinea pig litter box was a life-saver for me. While my foster guinea pigs weren’t 100% potty-trained, they started to figure it out, which led to their feces being mostly kept in one area of their enclosure. Mutts About Pets is reader-supported. When you shop through li