i have a dutch shepard now for 9yrs,as a pup of 5mts he was showing a lot off signs off dominance going up to dogs of 8 10 12 mts of age standing with paws on them and circling around them that sort of thing ,good friend of mine trains these types of dogs and dose classes for pups,he pointed out to me what the problem was that i already knew,i worked on the pup every saturday for best part of 4 mts mixing with other pups of all ages .8yrs on still the same problem very dog aggressive along with any thing small that moves quickly.my yard set up caters for a dog like this with plenty of enclose