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As a treat, or if you cannot find commercial hedgehog food, you can offer your pet low-fat cat food. Never feed your hedgehog fatty, fried, spicy or salty table foods or scraps, and use caution when offering hard food items, such as nuts, which may choke a hedgehog.
Another suggestion is to just use non-clumping cat litter. This may have two potential dangers: dust and especially for male hedgehogs, getting caught in the penile sheath -- the same as if you used it in a litter box [5.4], [9.1] (there can also be problems for females, though these are not as frequent).