The characteristics that LGD must have for me are two: 1 - aggression toward strangers and predators 2 - must spend more time close to the flock, in order to control at all times during the entire day on each shift. For the first point I think all the LGD are valid for the second I think there are major differences between one race and another. To better understand these differences you should consider the packs of dogs made ​​from a single race and not a mixture of races, and compare them. I think it is also more efficient in understanding each of them, for example in Abruzzo, Abruzzese shepherd dogs within the pack have several tasks, some dogs are more prone to attack the man ... those facing the predators ... other dogs while they are attacking remain with the flock ... when a sheep to give birth a dog often follows and stay with her until joins the flock ... What interested me know in this thread is just the difference between the races in the work by the owners who work or who have direct information, but not in packs made ​​up of mixed races, in this case the characteristics of a dog may not be a complete summary of the race.