I’ve only been unicycling about 2 and a half months now, so my Muni is limited to pretty tame trails, but I still find it a good way to challenge myself and exercise the dog. Here’s some of my ride from last week:
http://www.youtube.com/watch?v=wdR7lQdW0lw&feature=youtu.be
Somehow watching my dog follow me along just makes me laugh every time. 
Amusing is good. We like amusing. It’s great that you have the dog trained not to pass you and make you look bad. 
She’s well trained from mountain biking. I made a point of running into her every time she got near my front wheel for a while. Didn’t take her long to figure out the safe place was watching the crashed from behind. The only problem now is that the first thing I see after I recover from a crash is a big pink tongue coming to say hello. 
It does make it hard to be mad at the unicycle for long, though.