This is... this is a bit of an interesting piece.
I've been feeling a bit horse lately and a friend of a friend was doing quick piece so I thought; why not start with a quadrupedal form? He's got broadly the same markings as Gordon but he's not really the same person. This is a non-anthro reference, unharnessed, but he would generally be anthro and wearing a cart harness (Think Fury Fantasy).
And yeah, even quadrupedal Gordon horse has Human level intelligence and speaks.
Art by Kara Skacalac of Deviantart
http://karaskakalac.deviantart.com/