I just wanted to PM you. I just wanted to tell you that I certainly have challenges with my dutch shepherd. At 8 months I still don't know what I have and he can be a bit funny if he thinks a person doesn't belong. So far he has been great when "working" but there have been a couple instances when he barks defensively at people who don't belong on his trails or something like that. I have worked with a trainer who is teaching me how to use an ecollar. We use relatively low stim and his recall is dynamite now. I don't need him to be all friendly just mind me and let me be in control. Anyway, just wanted to share that and encourage the trainer route, but I feel (and I am no expert) that you can get this under control quickly.
Best.