Panting
If you dog is panting, it does not mean they are in danger. This is how dogs cool off from overheating. They do not sweat like humans, so they pant in order to decrease their body temperature. They likely need water when they pant, but they also do it to let go of pain or stress.
Eye Movement
Dogs are like humans in some ways. Their eyes also tend to show emotions. If dogs feel sad or tired, they may look at the ground. On the other hand, if they feel excited, they look around with their eyes wide open. Raising an eyebrow can mean they are confused. Take these things into consideration to better understand your doggo!