Shoulder sounds good, no leashes sounds even better! I can see her now... sitting around his shoulders and yelling in his ear whenever she's annoyed at him. How nice... >D

She's tested every boundary she can, all right! She's smart enough not to chew up anything in his house, fortunately, but she'll climb everything and remember what is in and out of bounds as of the first time he says it. The first day after the bath was probably him following her around the house and telling her "No, not there! Not there either - oh. Ok, yes, that's fine, just don't knock any of the books down..." etc. She can be (and will be) a great big bully, but he's letting her stay for free! She'll appreciate that.