I'm interested that you mentioned that the dog was following Trevor. Is Trevor the cute curly haired one? The youngest one?
I have loved animals all my life, even when I was a small child, creatures would come to me easily - even more so now that I have more conscious awareness of them ... I get followed by other peoples cats and dogs a lot these days and instinctively, I know where to lay my hands on them to send energy.
I always say there are no coiincidences and that the dog was attracted to your home for some reason. He was following Trevor for a reason. Maybe you could get Trevor to lay his hands on the dog - don't tell him how or why, Trevor will know how to do it. Young children have naturally strong energy and if he is a joyful child, like he seems in the photos, then my guess is he will have a lot of healing energy to share with this dog.
Healing energy from Trevor plus your herbs - now you have a special combination!