Thanks for the response, John!
As you can see, feedback had not been plentiful! Well, as long as there are no legal limitations, I guess why not. We have a dog, we have a sidecar and we want to travel through Africa and Siberia, so I guess if we can we will.
Her safety is very important, and it might be that she spends a lot of the trip on lead, or she may simply have calmed down a bit in the 2-3 years before we go (yes, that long to save up...).
If she can be trusted not to wander off, we should be OK. As for camping in the bush, I guess we just need to get used to the idea and keep picking up tips on how to avoid wildlife: the dog was just an extra concern to an existing concern...
Adventure: it's an experience, not a style!
(so ride what you like, but ride it somewhere new!)