Yawning can be a sign of submission to a dominant dog or human.
Yawning can also be a way for dogs to communicate with each other. For example, dogs may yawn in response to another dog's yawn.
Dogs may yawn when they are excited, such as when they are about to play or go for a walk.
Dogs may also yawn in response to humans yawning. This is because they are social creatures and they learn from the people around them.
In some cases, yawning can be a sign of an underlying medical condition, such as pain or illness.
Yawning is a normal behavior for dogs, but it can sometimes be a sign of something more serious. If you are concerned about your dog's yawning, it is always best to consult with a veterinarian.