There is nowhere else to hit, Chuck Norris's ultimate muscles defend everywhere else.
And I think this avatar seems slightly more epic than a cat eating a dog.
I pity the fool who thinks he/she can take on Chuck Norris! Even if you punch somewhere unpleasant (I assume the chin), you forgot one fatal mistake! Chuck Norris doesn't have a chin, if you live to pull back his beard of manliness, you would see that there isn't a chin under there, but ANOTHER FREAKIN' FIST. You would break your fingers in vain.