My mentality behind fox mod being such an asshole and unpredictable menace is that shes half WILD ANIMAL. her lore isnt really clear yet but she spent most of her life doing whatever the fuck she wanted and up until recently had to adjust to life around other people. Its like adopting an actual wild animal and then taking it out in public. itll act out because thats what it knows.

So she acts much differently than human mod for that reason! (im mostly writing this for my own character development needs heh)