Unless you're dead set on getting an aftermarket cable, there's nothing special about the cabling on the Mad Dog. It ships with the stock Fostex cable and V-Moda cable that 3.5mm to 3.5mm for use with portable devices or smaller amps like the O2. I've had zero issues. Now, if you want to used a balanced amplifier, then you'd have to get it recabled, and that's a job I would not suggest doing yourself. Moon-Audio is a good option if you need it wired for balanced use.
What is balanced use? and the advantages.....?