Hes probably upset about the situation and blames his mother but he still loves her and for his mothers safety he sent her to her room. (I hope this helps)
Well, when its in first person you get more of an insight on how they really feel and think while when its in third person you have to rely on a guess and not a fact. So it limits the readers knowledge on the thoughts and feelings of the main character. Hope this helps :)
try and use the word puppy when referencing the dog... this assignment is dumb im sorry you have to do it.