Raisins are actually not safe for chins at all. They are way too high in sugar which chins can't really easily digest, and can definitely cause diarrhea, as well as it can lead to issues like, seizures, gastrointestinal stasis, liver and kidney failure, blindness, and diabetes. They use to be the go to treat, about 20-30 years ago (and unfortunately a lot of people still go by that outdated info), but we now know how much damage they cause and they are no longer recommended.
Chins diet should be a high quality pellet only food like Oxbow Essentials for example, and timothy hay. They should not be given any fruits or veggies fresh or dry. As well as no seeds, nuts, or animal products (eggs, hide, meat, bone, antler, or dairy). Here is a list of safe treats
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