You are taking your dog for a walk off leash and feel that others who are walking their dogs ought to do something to ensure you dog does not run off? Otherwise

You are taking your dog for a walk off leash and feel that others who are walking their dogs ought to do something to ensure you dog does not run off? Otherwise they don't understand the issue? I assumed "off leash" because if he can run off even when on a leash, then it's worse than I imagined.