I didn't move fast enough to catch the moment when this dog was playing with another dog just like him.  I think they must be Great Danes with unclipped ears.  The owners didn't seem to know each other, just two random guys on the Upper West Side keeping dogs the size of Shetland ponies in their apartments.  It was all I could do not to jump into the fray myself.  Jess, Marc, I may take you up on that invitation to come romp with your dogs soon.  I'm needing a big dog fix (they don't need to be this big).  Wrestling with Coltrane leaves a lot to be desired.