Rolling her and biting her are signs of domination. You need to keep an eye on it. Some hamsters are very territorial, and will fight other hamsters, even if they are female. He can potentially hurt her.
Take it to the vet if you are still worried or perhaps reduce/alter its food intake.
If your hamster is injured and you are worried, it is perfectly fine to take the hamster to a vet. The vet can treat the hamster like they do any other animal.
It is very possible that a dwarf hamster may die if you step on it and it has blood from its nose. The hamster can be taken to a vet if you are worried.
If nothing happened then you shouldn't be worried but if you are concerned, then you should take your hamster to the vet for a checkup to make sure that your pet is okay.
That's it's testis... or gonads, to be informal. My hamster had it and I was increasingly getting worried, and when it went through the breeding proccess... well.. I found out.
well different hamsters will react different my Russian did so if she acts weird don't be worried
Do not feed your hamster oranges, tangerines or tomatoes. They are high in citric acid which is bad for them.
It means it prefers the corner of the cage than to its bed. This is nothing to be worried about. (:
hydrochloric acid
if u have to present a project and you're worried
Yes, it's always risky to operate on a hamster because they are so small. If you are worried that your hamsters will breed just separate them, it's easy and unexpensive compared to unnecessary surgery.
i have no clue. i have a hamster who is very upbeat and runs around, i showed him to my dog to get them used to each other and since then he has been very slow and sluggish. i am worried myself