Cut the hot dog lengthwise in half, than cut each half lengthwise again to create quarters. (If you're looking for larger treats just cut the hot dog in half, if you want smaller treats cut them lengthwise again).
Once cut into quarters cut down the hot dog, you can cut the slices as thick or thin as you like. If planning on drying them cut them larger than what you want since they will shrivel when cooked. If keeping them raw keep in mind thin slices tend to stick together.
Once all your hot dogs have been cut, spread a single layer of paper towel over a plate and sprinkle the pieces all over the plate. Try to spread them out as best ou can to avoid them sticking together.
Put them in the microwave for 3 minutes on high.
Allow to cool. If dried out completely these don't need to be refrigerated unless your planning on using them sparingly. With the rate I go through training treats these are gone in a few days.
Good luck with you training!