Panting
When your dog pants, it does not always mean that they are in danger. This is how they prefer to cool off when they are overheating. Since they do not sweat like humans do, this is their preferred way to lower their body temperature. They might also feel pain or stress when they pant. Make sure to give them some water!
Eye Movement
In many ways, dogs are not that different from humans. They use their eyes to express their emotions too. They like to look down when they are sad or tired. In the same way, they open their eyes wide and look around whenever they are excited. When they raise an eyebrow, however, they are likely confused.