i had something similar happen with Belle... i was at a meetup with another small dog group i belong to, and even though i had already said several times that Belle is very territorial about her stroller (which is HER space) this person then proceded to place her doggie in Belle's stroller
and Belle snapped at the dog, she didn't bite him, but she was pretty upset... the lady was like wow, she is so aggressive...i never thought she was, i just thought that she invaded her space, and that is why Belle reacted... i reprimanded her a little... but i felt badly about it...
sorry to hijack your thread!!!