dwarf hams

Question
Thank you so much for the info. I already planned on getting
chinchilla sand today for them. I do have a couple more
questions though. I cleaned the cage for the first time yesterday
and put everything back in (including the pine shavings which i
will get rid of asap) and also some toilet paper tubes. They
haven't fought since then but ill still get another aquarium. I
noticed on the smaller of the two that there is a small bald spot
right above his eye that he scratches sometimes. Right now I don't
have access to a vet. Could this be a reaction to the bedding? He
doesn't show any othersigns of ailment and is actually very active and
friendly. The other guy bites me whenever i try to pick him up, but
once me or anyone else have him up, he won't bite. Is this normal,
because they are around 2mths old and I know about the vision
problems of hamsters? What age do they g through puberty? As for the
hamsterball I read up about the one that I have and its from a trusted
brand. The air slits are not big enough for any part of them to got
through, this one is specially made for dwarf hamsters and mice and
they love using it. When they want to come out they run to me and wait
by my foot. Is there any way to tell if the ventilation in there is no good
or do you think its all of them? I always thought dwarf hamsters
were social but I didn't know they grew more solitary as they got
older. Does this mean they wont ever want or show signs of
wanting a companion? And if not does this mean that I can't take
them out to play at the same time? Again thanks for answering
last time.
~Shiko  

Answer
The bald spot might be an allergicv reaction or it might be caused by mites or a fungal infection. See a vet with the hamster as soon as possible to find out what exactly causes it, otherwise it might get very nasty. Mites can cause rodents to scratch themselves until their skin is bloody, I have a mouse who scratched half his ears away. There are over-the-counter meds for mites ect., but they are often dangerously strong or useless.

Dwarf hamsters often bite inside their cage, but are very friendly outside. This is because they defend their territory. A good way of avoiding bites of to train the hamster to come to a certain spot in the cage to be picked up, by giving it all treats there. I had a dwarf who always went and sat in a small bowl to be picked up.
Dwarf hamsters are able to breed at an age of 3-4 weeks and they are fully mature with 8-10 months, depending on their species. I guess you can call the time in between puberty.

In my opinion, all hamster balls are dangerous, some more, some less. But they all have the ventilation problem.

They will be comfortable alone, just as Syrian hamsters. You cannot let them play together once you seperated them, they will fight or will at least be very stressed by meeting another hamster.