Well said. Dogs, like children, will do what they are allowed to get away with doing.
Teach them early acceptable and non-acceptable behavior. Most will get it.
A few, unfortunately, are not mentally capable of understanding appropriate behavior. If that is the case with Trig, he cannot ever be responsibly permitted unsupervised access to this particular dog.
If it is not the case with Trig, then his parents need to explain to him how one responsibly treats a dog, and keep reinforcing the lesson, as they would with their other children.
It’s a service dog, dimwit.