Why do dogs look left first and then right

Dogs look left first and then right. It is completely due to body inertia. Some dogs will look right first and then left; just like most humans will step right first. The feet are the same as walking, it has no special meaning, it has to do with habit. Sometimes there may be movement on the left, and the dog will look to the side with movement first.
Because dogs’ sense of hearing and smell is far superior to that of humans, sometimes the dog’s actions are because it is observing whether there is any danger around it, which is caused by the dog’s habits. So there is no such thing as looking at the left first and then the right. It’s just that dogs may be more alert, so don’t worry too much about this.