Chihuahuas are originally from Mexico, so as a breed they tend to prefer spicier foods. Also, there is a special kind of field mouse native to northern Mexico called, in English, beast of the plains that they prefer. Your answer will be published for anyone to see and rate.
Residency is a stage of graduate medical training. A resident or house officer is a physician (one who holds the degree of M.D., D.O., or MBBS, MBChB, or BMed) who practices medicine usually in a hospital or clinic under the direct or indirect supervision of an attending physician.
All physicians first complete medical school (MD, MBBS, or DO). To become primary care physicians, medical school graduates then undertake postgraduate training in primary care programs, such as family medicine (also called family practice or general practice in some countries), pediatrics or internal medicine.