Session 1: When to get a truffle dog to train?

This is the first session of a multi part series of Q and A sessions where I answer the most commonly asked questions I get as a truffle dog hunter and truffle dog trainer. Each session will focus on one particular aspect of truffle dog selecting and truffle dog training. They don't have to be watched in any particular order so feel free to pick and choose which question you would like to know more about.
Feel free to ask any questions in the comments or any topics you would like me to cover in future Q and A sessions.