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My hamster is getting bigger and I don't know if it's a boy or a girl!!

I currently have two hamsters that I bought from a local pet shop. When we bought them we asked for them to check the gender and they said that they were both males. But there’s one problem. Our hamster Boris is a lot smaller than our other hamster Nano. They are both Russian Cambell Dwarf Hamsters so they are meant to be quite small. Nano is very large (bulky) and doesnt run very fast, while boris is small and very speedy. When we first got them we put them in the same cage to see how they got along and then found they were fighting and separated them. We’re currently questioning if Nano is actually a girl and pregnant instead of a boy as we can’t tell his/her gender when we place him on his back. We know for sure Boris’ gender as we checked and were able to see his penis. Do you have any answers to this or any ways we might be able to find Nanos gender? Side Note- We bought Nano and Boris on the 17th of August and it is currently the 9th of September.

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Answer #1

This is Boris

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