I started to train my first dog from the moment he came home with me. It was fun. It was, if I’m totally honest, pretty easy, too. He was a Labrador and his eagerness to learn and please me made training him fun, enjoyable and almost without exception, flawlessly simple. Then he grew up. Things began to change. Luckily for me, I discovered the most important dog training tool I’ve ever used. I swore by it then, I still do now. I’ll gladly tell you what it is.