Well, most DO schools require that you shadow a DO and get an evaluation or recommendation letter which will be part of your supplemental application material. A DO evaluation is among the other things like GPA, MCAT, personal statement, that are considered during the admission process. I shadowed I DO who was a Clinical faculty at the school I applied to, and
during my interview, I was told that my DO recommendation was excellent.
IMO, if you find a DO , arrange to shadow him/her once a month throughout your Jnr and snr year.
GOOD LUCK