Now that I know a lot more about Greyhounds than I thought was humanly possibly, I rescind my analogy of Beast to a Greyhound, though I will stick with my comparison of the F650 to a Jack Russell terrier. A this point, the best "bike" = "dog" analogy I can make using a greyhound and a BMW is "Campaigner" = "Carrie."
Campaigner sits for extended periods without ever moving.
Campaigner has a long, successful professional career behind it.
Campaigner can be provoked into speeds in excess of 40 MPH on occasion.
Carrie, likewise. (So we have been told.)
Campaigner is beautiful in a classic, elegant, understated way.
So there you have it. The perfect Bike=Dog metaphor.