How do you help (highly) anxious guests?
My husband and I have a German Shepherd rescue as our guest right now who has a very hard time calming down. She is just over 1.5 years old. She is frequently, almost constantly, pacing around the living room and whining or whimpering. Her startle response isn't too bad, but I did notice that she jumped when we were outside and she heard a loud truck noise. She also has some anxious-aggressive behaviors with other dogs. When in her crate while other dogs are moving, she barks and snarls and jumps away from where they are. My husband had a hard time introducing her initially to our dogs because of her anxiety-triggered aggression. However, now that she's adjusted, she is highly social and playtime seems to be the only thing that keeps her from pacing and whining. Yet even when she's playing, if there's a pause, she will start looking around and whining again. This is all after I took her outside this morning, played fetch, and ran around with her on a long leash to the point where she seemed really tuckered out when we got back. Fortunately, she does eventually calm down at night when she is in her crate.
What do you do to help dog guests with anxiety? How can you tell if it's anxiety triggered by separation or just general anxiety?