Panting by an overheated dog is example of what?

Here's why:

* Thermoregulation is the process by which organisms maintain a stable internal temperature.

* Dogs, unlike humans, don't sweat efficiently. Their primary way to cool down is through panting.

* Panting increases airflow, which evaporates moisture from the tongue and respiratory tract, thus cooling the blood and body temperature.

So, when a dog pants, it's trying to regulate its body temperature and prevent overheating.