The Electric and Electronic Dog Walker

My son is a professional dog walker. He’s in demand because he gives dogs a lot of exercise for the time, and he sends the owners pictures and video of their dogs in action, as well as route maps and time stamps. How can you walk 10-15 dogs a day and run each of them 2-4 miles? A Boosted electric skate board helps. Cost for walking a dog:  $25 for 25 minutes, and $35 for 35 minutes. He's got as much business as he can handle, all of it regular.