Yes, but you don’t need many supplies to become a dog walker. A high-quality leash is good to have on hand, along with a bag to carry supplies and your own belongings.  Disposable poop bags are also necessary.  Other supplies such as dog treats, a bowl and water, an umbrella and dog toys are nice to have. As you gain more experience, you will figure out what are must-have supplies for you and which ones are optional.