Tell me about the different coat types for border collies.
Sure! All border collies have double-layer fur. The inner layer, or undercoat, is soft. The outer layer is coarse. Coat lengths vary from short to long. Border collies generally have two different types of coats:

Rough-coated border collies have long to medium outer coats. They have feathering on their face, stomach, and legs. Their undercoat can be dense and rough-coated collies need frequent grooming to prevent matting. These dogs may look similar to the iconic Lassie. 

Smooth-coated border collies have short hair all over and little feathering. Their undercoat may be thinner and they may have straight or wavey outer coats. Their coat is much easier to maintain and this type of coat is often preferred on farms and ranches. 

Of course, border collies can also have a mixture of coat types. There are also uncommon coat types such as curly-coated and bearded. 