I just finished using my bag of shavings and have bought my chinchilla a new bag of Great Choice Aspen Wood Shavings, however, he seems to be pigging out (eating) it a lot, are there any risks or is it perfectly normal?
If the hay is dry and kept in a cool, ventilated and dry area and free of mold, I would keep it for about a year as long as the chins are still eating it.