system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why is it that big dogs drool alot while small dogs tend not to drool at all?
gpt
Larger animals have to work harder to keep cool. Volume, which determines the amount of heat produced, goes up with the cube of the length of the animal but surface area, which determines the rate that heat is lost, goes up with the square. Dogs cool off by panting while producing drool instead of sweating. Large dogs have to drool more to maintain their body temperature in the same way that overweight humans sweat more to keep cool.