It's tempting to let your dog run free when you think the risks are minimal, but situations can change in an instant. The presence of other animals, unexpected vehicles, or hazards like glass or metal shards in your path can create conditions that may lead to injury or worse. When presented with new situations, animals can react unpredictably, so don't assume that your well-behaved pet will always take the safe choice when presented with a set of unfamiliar circumstances. When tethered, you have control of your animal and can guide and protect him. You'll also be protecting others, which is why in most areas there are stringent leash laws in place.