One of things covered second year is professional responsibility. In other words, ethics. One thing that is apparent is that lawyers are not that respected in society. And some lawyers do not help this. Describing one as a "pit bull" does not help with this stereotype. Take a look around You Tube at the commercials for lawyers---terrible. It is that idiocy that leads and perpetuates the reputation that lawyers have earned.
Some would look at this attached commercial and think, cute, original, harmless. I look at it and see comparing a highly skilled attorney to a dog that is known to kill and to go for the kill. Lawyering, good lawyering, involves skill and diplomacy, not animalistic kill instincts.