Here's why:
* Increased Airflow: Panting involves rapid, shallow breaths that increase airflow through the respiratory system. This allows for greater heat exchange, as warm air is expelled and cooler air is inhaled.
* Evaporation: As the dog pants, the moisture in their mouth and respiratory tract evaporates, which takes heat away from the body. This process is similar to how sweating cools humans.
* Lack of Sweat Glands: Unlike humans, dogs don't sweat very much. They have sweat glands primarily on their paw pads, which are not effective for overall body cooling. Panting is their primary method for regulating temperature.
* Anatomical Differences: Dogs have a different respiratory anatomy than humans. Their nasal passages are longer and narrower, which allows for more efficient heat exchange during panting.
Breathing slowly, on the other hand, does not significantly increase airflow or evaporation, making it less effective for cooling.
Therefore, panting is the most efficient way for dogs to stay cool and prevent overheating, especially in hot environments.