Here in the U.S., pork
is classified as a red meat by the U.S. Department of Agriculture for the following reasons:
Why is Pork a "Red" Meat?
Oxygen is delivered to muscles by the red cells in the blood. One of the proteins in meat, myoglobin, holds the oxygen in the muscle. The amount of myoglobin in animal muscles determines the color of meat. Pork is classified a "red" meat because it contains more myoglobin than chicken or fish. When fresh pork is cooked, it becomes lighter in color, but it is still a red meat. Pork is classed as "livestock" along with veal, lamb and beef. All livestock are considered "red meat."
Check here for more:
http://www.fsis.usda.gov/Fact_Sheets/Pork_from _Farm_to_Table/index.asp