they love it when you have a different major. Remember, the name of the game is to be different and stand out from all the other applicants. They know youll learn everything later, they just want to make sure you know your basic sciences, so if your DATs are good, you are golden.
However, once you are in, it might be harder for you than others. For instance, I majored in microbiology, so Ive done courses in micro, immuno, pathology, anatomy, biochem etc. Thus, the material wont as new to me. But they teach everything from scratch. Also many schools have recommended pre-reqs... I would look at them, and try to take those classes.
Good luck,