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I made this fox rig for the realistic animation class with the great Linda Bell.I feel obliged to mention that I am not a rigger and this may not be the most fancy quadrupedal rig out there, but it is straight forward and easy to use. It comes with textures so you don't need to do it.
Give it a go and feel free to use it for anything you like and change it to serve your needs. If you do so, I'd be thrilled to see your animation.