Pavlov's Dog describes people's resistance to thoughtless logical speculation. Pavlov discovered and opened up a cognitive road, which made researchers have a basic understanding of how animals learn. It's all because of the drooling dog.

Pavlov, a German psychologist, did a conditioned reflex experiment on dogs: he rang a bell before feeding them. Over time, dogs learned to use bells as a prelude to eating. Later, as soon as the bell rings, the dog will start drooling with or without food. This is Pavlov's famous conditioned reflex theory. So Pavlov's dog can be understood as a conditioned reflex without going through the brain.