Most people don't know that some foxes can run up to 31MPH when they really feel like it. As such, any natural looking fox animation is going to come out a little on the zippy side. Therefore, I added a half speed version of my video so people can see what is going on here. Rig is by Daniel Moos, from https://www.highend3d.com/maya/downloads/character-rigs/c/fox-rig-for-maya
Fox Gallop Cycle Real Time
Fox Gallop Cycle Half Speed