But, actually, he chose a stag because it was large, powerful, and fast. It could survive a werewolf attack (assuming the worst case scenario happened). When the Marauders told Remus they were animagi.
Seriously one of my favorite Dobby lines of all time." "Dobby never meant to kill. Dobby only meant to maim, or seriously injure. right after he's done dropping a chandelier right over Madam Lestrange's head.