as hard as it might be to hear this, after barney has found his home, you need to think about not fostering dogs again. i have friends in pug rescue, and their mix breed, finally had enough of little puggy visitors, it was too hard on her. she made the visitors, humans and herself miserable by acting out her stress . i can guess how hard this for all of you, but for the sake of your own dog, home peace and your peace of mind, think about not fostering. i am sorry to suggest this.