Oh my, I will talk to my son about training Thor and asking whether his parents were also LGD. He was not put with the goats until he was about 3-6 mo. old, I wonder if that makes a difference? He was in the house before that then they realized he wasn't a house dog and he should be with the goats. What if these are different goats? He started out with another breed and then decided to raise just Nubians so all the current goats are not ones he was raised with.
He doesn't go after the chickens or guineas though.