I find that using hand signals is the first step – you can’t teach voice commands until the animal knows the trick, usually with hand commands. I’ve also found that Otto does not understand voice commands and works totally on visual commands. My theory is that bunnies aren’t very vocal creatures – being prey animals, they’re more likely to communicate with each other using body language, so I think it’s easier for them to understand our body language. They seem to understand generic sounds, but not specific words. There are many smarter bunnies than Otto, so this theory might not apply to all, but it seems true of him. I do use the clicker, because I found he got the idea of tricks much faster. The clicker is basically a communication device, and using it allowed me to tell him when he was doing what I wanted.
I have yet to train Hannah, but I need to get on it because she’s smart as a whip. I know she would learn quickly, I just haven’t gotten around to training her yet.