Yesterday we purchased two young dwarf hamsters from a local Petco. They are brothers and get along quite nicely. One of the hamsters seems to be healthy and happy- running around, curious, eating, and runs on the wheel a lot. The other is our problem. (It may help to note that he was the runt). We were told that both hamsters are males, but this hamster's behavior could suggest that it may be female, and pregnant. It doesn't like to be touched, and yesterday slept all day and night. Most of the time it has its eyes closed and doesn't move too much. We haven't seen it eat, drink, or run on the wheel yet. It also looks a little chubbier than the other dwarf. Initially we thought that the hamster was just adjusting to its new home, but 24 hours later this behavior has continued. I've had lots of hamsters before, and none have acted so strange. Is the hamster dying, pregnant, or just odd?