Border collies are awesome. My Ibizan Hound loves to mountain bike with me, and can definitely go faster than I can bike.
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Hypothetically, my whippet has run with me while I biked on the C&O canal towpath for 8 miles at 4:18/mile pace, including a 2:49 mile. I say hypothetically because I certainly wouldn’t let him off leash on the towpath, particularly not at 12:30 pm on a cold Tuesday in the winter with nobody else around. 😎
http://connect.garmin.com/activity/297720113 He could definitely go faster, but I couldn’t go faster in the gravel/mud than 21.3 mph for any longer.
Supposedly a saluki will run 2 miles in 4 minutes. Not quite as fast a sprinter as a greyhound or whippet, but a lot more endurance.