Boy or Girl

Question
Hi Lauren I have a question for you. I have 2 dwarf hamsters. The only problem is I cant tell if they are a boy or a girl please help me out with this one. I need this information asap.

Answer
Male hamsters develop rather large testicles that are very out of proportion with their body size.  Generally, if it's a boy, you'll know it.  If he's still very young, it may be harder to tell.  Generally, the distance between the genitals and anus is longer in males.

Hope this helps!
~Lauren