Certain brands and types of bedding can make your hamster need a trip to the lovely vet. I recommend you buy care fresh. It's all natural bedding. Never buy pine, or cedar bedding! It's bad for your hamster's respiratory system. You should buy fluffy paper bedding, or aspen bedding. Also pine bedding has a lot of dust in it. That is very bad for a hamster! Also bedding comes in many colors. For example: blue, green, pink, etc. The coloring is non-toxic and safe for your hamster.