Pictured next to a bowl of deer liver is a 3 ounce plastic perfume bottle that will squirt or drip blood. In the bowl is cooked deer liver for the reward, (I usually use raw but it was getting old). In the bag are hotdog slices to lace the track. Rowdy started off with liver drags but has graduated to blood. Rowdy's breeder told me to make tracks easy, successful and fun to reward and create prey drive, so I lace the track with hotdog. The hotdog makes the dog work close to the line, so they don't work the scent plume 10 feet off the track. I use hotdogs with Elkie from time to time to tighten her up.
The next step is to gradually age and lengthen the track, then add a leg drag with blood, then hooves and blood and finally just hooves with very little blood. The reward can be anyting from a deer that the doog likes, such as hide, leg, tail, liver, heart, venison...