it appears the dog gets “jealous”, although without observing the behavior of your dog and knowing her traits, it is difficult to understand the true reason. i mean, do you give her plenty of attention around other dogs, does she have bad anxiety in general, etc? i would try to increase the bond between her and other dogs and you, and see if you have anyone with other dogs willing to help you out. socialization. it appears as if she is resource guarding you although it could just be dominance. you have to try and get her to see that another dog being around you is a good thing, and praise her when she acts correctly. i would not get another dog quite yet although i would look into a behaviorist to determine how to go about your issue — i can’t help you as well as i’d like considering i’m not physically with the dog and your position is a tricky one. —fib