Training for a Doctor of Chiropractic is very thorough. There are differences in all schools of medicine. Chiropractors, in general, have more training in physical diagnosis, nutrition, radiology (X-Ray, MRI, etc), neuromusculoskeletal system, and wellness/homeostasis than other primary care doctors. This has played out in "the real world" is both patient satisfaction and cost of care.
Both chiropractic and medical schools require certain course work for admission. These vary from school to school. Very few schools of either type require a bachelor's degree, although some specify that they prefer the applicant have such a degree.
Chiropractic colleges do not require the MCAT. Some medical schools do. Contrary to common belief, some medical schools (including high profile institutions) require the bare minimum of undergraduate requirements.
We took the admission requirements for medical schools from the publication titled: Medical School Admission Requirements, 1997-1998: United States and Canada, 47th edition (published by The Association of American Medical Colleges). Admission requirements for accredited chiropractic schools are dictated by the Council on Chiropractic Colleges (the agency appointed by the U.S. Dept. of Education to accredit chiropractic colleges).
The Parker College study reported that on average, chiropractic college involves 372 more classroom hours than medical school. Chiropractic students also have more hours of training in anatomy, physiology, diagnosis, and orthopedics (the musculoskeletal system).