[header] How to walk a big dog as a kid [title] Hold the leash with someone else. [step] Before you're able to walk the dog on your own, go along for walks with your parents or older siblings who are big enough to handle the dog. Ask if you can help hold the leash. 
Some leashes, which can be found at pet stores or online, even have extra handles for this reason. You can also use 2 leashes-one for you and one for the adult.