No...no other small animals will really work as a buddy for him. I have heard stories of gliders actually killing other animals like mice. Even if somehow you got around that and Laswell didn't attack your new pet, mice and hamsters and other small animals won't really fulfill his need for a companion. They don't have the same behaviors as a sugar glider, and don't "speak the same language" as gliders do.
Sugar gliders are highly social animals. You really should try to find a way to get a nice big cage and a glider buddy for Laswell.
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