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How to keep your hamster comfortable when it is sick or dying
Move your hamster to a separate habitat.
If you have a habitat that houses multiple hamsters, provide your sick or dying hamster a separate space to rest. Using an isolation habitat can keep your hamster comfortable, prevent stress from other animals and activity, and minimize the risk of disease transmission to cage mates.
Place the isolation habitat in a location away from other pets, family members, bright light, and noise. Make sure the new tank into which you move your hamster is large enough to keep it comfortable.