Do hamster get rabies and do hamsters need to get vaccined?

It's common for hamsters to become aggressive toward each other as they mature. You did the right thing by separating them & the one who seems "crazed" could be acting this way because of the injuries or stress from the other hamster. It's extremely unlikely for anyone as small as a hamster to develop rabies.

As you know, an animal can only get rabies from another animal who has this disease & the bite itself is nearly always fatal to the rodent before the virus has a chance to incubate.

All animals even humans has a rabies... but for hamster, I think its not dangerous at all.. they bit me a lot but im still ok..

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