sentences:  The changes occurred due to outcrossing with other dog breeds, possibly the Borzoi but more probably the Greyhound.These physical changes further separated the original Scotch Collies from the collies which developed from it.The Scotch Collie was at one time registerable by the United Kennel Club as well as the National Kennel Club (as the Old Time Farm Shepherd) but, at some point, lost recognition and began to be absorbed into other breeds, including the English Shepherd, which opened its registry to the breed.