I know of one LGD guarding some sheep, along with a llama in my area. A couple times when biking with one of my Tosas, this dog squeezed through his fence to come out in the road after me. Good thing he or she is not so aggressive (maybe cowardly), cuz when i hopped off my bike and went towards the dog to take a picture it shut up and backed away. Gotta be careful with those dogs, have some excellent fencing that they can't bypass.