We went to demonstrate spinning and nalbinding yesterday and they had security dogs. Thankfully they weren't out, instead they were crated in a open van near the entrance, what happens when they saw us? they started barking! Later I saw one walking past wearing a muzzle with its hackles up!
If you see a security dog be careful around them!
I have been looking into the regulations around security dogs and there are basically none! which means there is nothing stopping the dogs being improperly trained or reactive. I have met a security dog "trainer" and my mother has seen her "trained" dog, it was only under control because she had it on a leash
I know its the same in other places too
It was also a dog friendly show, there where a lot of dogs but the nice thing was it was mostly well behaved gun dogs! Unfortunately there where still some not well behaved pets too. Including one that all most bit Fanta as we were walking past for absolutely no reason, the owner did not see anything wrong

and another dog that dragged its owner towards us, he barely managed to get his dog to walk past, he wasn't even really trying