I've never had a chinese hamster so don't know the answer. Are you keeping two hamsters together? One looks lighter than the other. Is the one on the left the one who is changing colour?
The one on the right is definitely a chinese hamster, but I'm wondering if the one on the left is actually a russian dwarf. Do you have any more photos? (I just looked at the one on your avatar). Chinese hamsters don't change colour - unless they are older and going grey maybe.
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