To be honest, while I think the composition would be effective here in this case I really feel like that blurring the lines to imply speed wasn't that great of a decision since it detracts the quality of the cat himself. What I would have preferred to see here is the use of some crafty line work to imply the speed of the cat.
I think that would have been more effective because the composition works, just not the use of the blurring of the cat. Otherwise I would have enjoyed the use of minimalism here.