At such a speed, the ears should turn a bit backwards and the head is too high in the air. Usually the back is moving a bit more up and down. The tact doesn´t seem right either...

But the animation is amazing.

Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en)
Shader Tutorial (ger)

http://www.slindev.com