Animals with 4 legs usually walk the same way, ie, only one foot off the ground at any time. look at Puss Puss here, most odd. On his right side his front and back legs are in unison.
That's what I mean Boxy. A normal cat at any given time has the front leg touching the back leg on the same side. Puss used to walk as if both front and back were connected, much like wheels on a train. XXX
It's called a parallel or pacing walk. It's normal in giraffes, camels, and bears, but can be occasionally seen with most other four-legged animals Supposedly it reduces the energy needed in covering long distances.