His bite is bigger than his bark

This afternoon, Mom and I were sitting on the couch.  This cute little guy was curled up at the end of the couch with us.

That's when his brother (see the resemblance) came along and started sniffing around. 

Well, Frankie didn't want Sam to interfere with the attention he was getting on the couch or take his spot.  So, my little 8 pound dog attack the 55 pound boxer.  Poor Sam is now missing a chunk from the tip of his right ear.  ( I tried to take a picture but he let out a loud whine when I tried to touch it.)  What did Sam do about it? 

Nothing.