Source : Webster's Revised Unabridged Dictionary (1913)

Jog \Jog\, n.
   1. A slight shake; a shake or push intended to give notice or
      awaken attention; a push; a jolt.

            To give them by turns an invisible jog. --Swift.

   2. A rub; a slight stop; an obstruction; hence, an
      irregularity in motion of from; a hitch; a break in the
      direction of a line or the surface of a plane. --Glanvill.

   {Jog trot}, a slow, regular, jolting gait; hence, a routine
      habit or method, persistently adhered to. --T. Hook.

Source : WordNet®

jog trot
     n : an easy gait of a horse; midway between a walk and a trot