To start with I am neither 'Mad' (not much anyway) nor do I growl or bark!
The story goes like this, I bought a Harley Davidson Sportster Custom 883 a few years ago and the previous owner had fitted a number plate with 'Mad Dog' printed on the bottom. Well the guys at work started using this as my nickname, and it kind of stuck! not that I mind as it does make for a good biker image.
You know the stereo-type...beer drinker, plays Motorhead and Hawkwind far too loud, goatie beard, shaved head, Triumph T-shirt & combat trousers........shit that's me!