From what I have read, most DOs are in family practice. With that, the hours are mostly during the day. Are they on call as much as a regular MD? I would assume so. Being a family physician, they probably wouldn't be called in to work at night or work odd hours. This is something that is attractive to me because I don't want my job to take a lot away from my family. Also, if I went to my doctor with say, a sinus infection or stomach problems, how would treatment with a DO differ than with a MD? Basically I don't understand the difference between how the two treat patients in a primary care position.