Being a dog person first and foremost, the concept of purring is pretty neat, especially since all felines do not purr.
Purring is one of the many behaviors cats have when trying to show us their emotions. They typically purr when they’re happy, comfortable, and resting, but they may also purr when they are startled, upset, or sick.
The nervous system drives the body to purr based off the cats emotions. The brain sends electrical impulses to the respiratory system.
The laryngeal muscles and the diaphragm create air movement within the larynx, causing a pressure build-up. The air is then released through the vocal folds which constrict and dilate as the cat inhales and exhales, creating the purring sound.
Not all cats have a true purr. Domestic cats, Bobcats, Cheetahs, the Eurasian Lyx, Pumas, and Wild Cats are the only felines who truly purr. Lions, Leopards, Jaguars, Tigers, Snow Leopards, and Clouded Leopards, make a purr-like sound, but they do not exhibit a true purr.