a mean German Shepherd

We didn't go to the playing fields tonight, but Kane had an exciting time. He said hello to a Red Setter who lives up the road, then I took him back to Tim and Toni's for a few minutes to say hello to the kids. Then we walked to the shops. On the way back, the young German Shepherd guard dog (Sasha) at the apartment block building site, opposite the shops, started barking (behind a fence of course). No reaction from Kane - he is such a calm dog. Her handler came over to calm her down. We had a chat. He told me she is two and a half years old and fully police trained. Trained to hate other dogs! Hmph!