I know this is getting further off-topic but I was curious and did some more looking around, I found several references about borzoi possibly being bred with collies to give them a more noble appearance. This bit was particularly interesting:

Borzoi stock may have been introduced into the early rough collies to give the dog a distinctive appearance. Even today certain borzoi characteristics crop up in rough collie heads. Other sources indicate the Irish setter was used in early breeding - the collie's sable color may be the indirect result of such a cross. Smooth collies may contain a Greyhound influence - smooth collies still occasionally turn up with hound-like traits, and they are much faster than their rough counterparts.
Taken from this site: http://www.petpublishing.com/dogken/breeds/collie.shtml