My younger dog used to be very reactive to being touched, especially around her neck, so leashes were an issue. I opted to use a slip lead for her, which allowed me to loop the leash around her neck without having to get so close. You can use his normal lead backwards if you don't have a slip lead around. Just run the end that clips to his collar back through the hand loop at the other end, and pull it to make a small loop. Then you can carefully place the loop around the dog's neck (sometimes dragging it up their body works better than trying to hold the loop with your hands), and pull it tighter so it doesn't fall off. A lot of professionally made slip leads even have an adjustable stopper, so it can't be pulled too tightly around the dog's neck. I keep a variety of collars, leashes, and harnesses around to experiment with in case the equipment the owners brought isn't working out well for me.