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If you are talking about pet rats, they are prone to many diseases. Pneumonia is the number one killer in rats. They can catch it from humans but we can't from them. Usually they get it from improper cage cleaning and/or ventilation (some think a glass tank is a good enclosure and it is the worse since there is no air flow). Also the type of bedding used is a cause of pneumonia as well. Aspen smells great, but that is the problem. The best bedding to use is recycled paper. The other killers are tumors(Cancerous and non cancerous), And cancer

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11y ago

What else can I help you with?