There are quite a few allopathic schools that take DO transfers--Temple, University of Illinois, Brown, Drexel, Tulane, to name a few. Like any transfer from one med school to another (MD to MD, DO to MD, DO to DO, etc.), it is difficult. You usually have to have personal reasons that really jump out at the addcom. A student in my class at TCOM just got accepted into the thrid year at Baylor. She had very good reasons for doing so though. Because she was not exactly at the top of the class, I would have to say that the personal reasons are more important than any academic credentials a student brings to the table.