Smooth Collies have short, dense and flat coats. Rough Collies are the opposite, where they have long and coarse coats. They do blow coat once a year, but for the most part their coats are generally easy to care for. That is, if you do yourself a favor by brushing two or three times per week.
The colors, according to the American Kennel Club come in: Black white and tan, blue merle, blue merle and white, blue merle white and tan, sable, sable and white, sable merle, sable merle and white, white, white merle.
The following four markings are acceptable according to standard: black and tan markings, blue merle markings, sable, sable merle markings.