Mr. Ewell and Tom Robinson are both in a courtroom. They are arguing and fighting. Therefor, it is a man vs. man conflict.
There was a dog with rabies walking down the street which led to many people being in danger, but Since Atticus has a good history with shooting he saved the day and killed the dog. Overall,since the dog and Atticus were in conflict it was a man vs. nature conflict.
Atticus is experiencing a man Vs. Society conflict because the town is against him defending Tom Robinson. They are all against him and feel he should not stand up for a black man, therefore,it is a man Vs. Society conflict.