MASSIVELY PARALLEL

I saw something I’ve never seen before: dogs walking each other.  There was a graying professor type who looked to be in pretty good shape taking his dogs down to the track while he ran.  Two dogs, both of the Benji (or Einstein from Back to the Future) variety, one a little larger than the other, were leashed together with about 2.5 or 3 feet of cord.  The smaller, younger one would pull in one direction to sniff a crumpled paper cup, and the other would wander, tugging the first back in another direction.