Re: Hamster behaviour - arched back
As far as I'm aware this posture does indicate pain. As prey animals they hide their discomfort so as not to look more vulnerable to predators so this may very well be the only sign you get that something is bothering her. It may be a sprain or some stiffness, or it could be an internal issue so the only recommendation I can make her is that she sees a vet.
Hamsters "show off"/ show aggression by rearing up when they're threatened, not hunching over so I wouldn't apply guinea pig posture here at all.
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