system
Given the following post, respond as if you're commenting on Reddit:
human
If humans pant, we hyperventilate, and collapse eventually. Why don't dogs have this happen when they pant due to getting hot.
gpt
The reason a person (or a dog) would collapse when hyperventilating is due to **rising pH of the blood**. This can happen if you breathe quickly and deeply enough that the CO2 levels in your blood drop too much for your body to compensate (through metabolism).

When your CO2 levels drop too much (and thus your blood pH rises too high) it is known as **respiratory alkalosis** which causes dizziness, headaches, etc.

Dogs can't sweat like humans, so they pant to increase the amount of moisture evaporating from their bodies (and thus cooling themselves down).

The reason the dogs don't suffer from the pH change when panting is because they are doing rapid, but extremely shallow breathing. **A shallow breath exchanges much less air in your lungs**, and limits the O2 & CO2 exchange in your blood.