Alright so one girl mouse got pregnant (I didn't plan on this) and she had five babies, one was a girl, and the other four were boys. So I separated the boys once they started eating food. They have been together since birth and I was told because of that it would be unlikely that they would fight. Unfortunately the runt is actually causing fights with the other mice. He is currently being treated for a respiratory problem and I believe is on bactrim. Could the meds be causing this change in him? He is fine when I hold him and they are about 4 months. Before he started takings meds they were all fine.
sorry I had to delete the question because it wouldn't let me edit.
sorry I had to delete the question because it wouldn't let me edit.