I have two at the dog park, Ruth (quick_trigger) and Bunny (itisenough). Sussing out how they'd feel about anyone is pretty easy, since they each tend to fall in one general direction: Bunny likes just about everyone and Ruth likes just about no one. How Gavin feels about them is another thing entirely! But Bunny would always be generally friendly, unless given a really strong reason not to be, whereas Ruth would be more withdrawn and chilly.