How do admissions committees feel when an applicant applies to both MD and DO? I know they don't always know but what if they ask about it? Is it looked upon negatively?
I applied to both MD and DO schools, and I was asked about it specifically at one DO school. In fact, I was grilled about it at that school. It ended up being no big deal, however, because I just replied to the questions honestly. I don't think you'll face any problems from MD schools (generally, they don't care and won't even think to ask), but some DO schools might be somewhat concerned that you are not actually interested in Osteopathic medicine, or their school, but are using them as a backup option of sorts. Not all DO schools care, but some do, and therefore might probe you about it to see where you stand. Obviously, it stands to reason that they are interested in accepting people who actually want to attend their program. I think you will be fine, however, if you can demonstrate authentic interest in, and knowledge of, Osteopathic principles and their school.
On a personal note, I agree with the above posts and think it's a good idea to apply to both MD and DO schools as well. You are looking for the best fit and the best programs that you stand a reasonable chance of getting into; naturally, this can span across both types of programs. If having an MD isn't a limiting factor for you and you think you would like OMM/OMT, then you are wisely expanding your options and choices.
Quite honestly, there isn't that much difference between MD and DO medical schools now-a-days, with the exception of integrated OMM/OMT training, a general focus on the Osteopathic tenents, and maybe, in some DO schools, additional attention to primary care and the medically-underserved. However, you can find similar curricular focuses in Allopathic schools, too, with the exception of integrated OMM/OMT training, which is exclusive to Osteopathic medical schools (although you can probably learn OMM/OMT post-graduate as an MD as well).