Aerodognamics

There is no better dog 'fit for purpose' than the Longdog.  As running dogs go they are pretty much perfect.  They are so aerodynamic that even their ears form back into a point on the backs of their heads when they are running.  Their back legs are like springs driven by pistons and they have powerful shoulder muscles that can carry them up a hill in a few seconds.  Bet what you didn't know is that a male running dogs testicles are placed in a line instead of hanging adjacent so that they don't 'clatter' when the dog is going at speed.  Now wouldn't that be handy Usain Bolt?