Why Do Cats Make a 'Grrr' Sound?

Part 1: The Origin of a Cat's Purring Sound

In the medical realm, a cat's larynx consists of two parts: the thyroid cartilage and the cricoid cartilage. The larynx is divided into three main sections. The upper section is the laryngeal vestibule, with the false vocal cords forming its posterior edge. The space between the true vocal cords and the false vocal cords constitutes the second part of the larynx. The third part is the cavity between the vocal cords and the cartilaginous rings. The purring sound of a cat is produced by the vibration of the false vocal cords, resonating through the larynx. Unlike humans who snore due to fatigue during sleep, cats emit a light, contented purr when they are happy or relaxed in their owner's arms. Puppies tend to purr less frequently, but adult cats do so more distinctly. This is because as they mature, cats become more appreciative of the finer things in life, and they will purr with contentment when they receive affection and attention from their owners. Additionally, both kittens and adult cats may continuously purr due to viral respiratory infections, which can indicate an infected heart.

Most of the time, kittens emit a meow sound to express their happiness.

Part 2: Various Situations in Which Cats Purr

1. When a cat is in a good mood and feeling joyful, its purr is a sound generated by the vibration of the false vocal cords resonating through the larynx. When they are satisfied, relaxed, or excited, they will emit a light, cheerful purr.

2. To attract your attention, a cat may purr when it wants to play with you or is content and satisfied. You might hear a lively and loud purring as it lies next to you, sleeps, or engages in close contact.

3. While being massaged, the comfort of the massage prompts the cat to emit a "rumbly" purr, indicating its enjoyment and encouragement for you to continue.

4. Cats may purr when they are particularly fond of someone or something, with some cats emitting purrs simply by snuggling close to their owners.

5. Even when they are lazy and lounging with bare paws, cats may purr contentedly.

6. When a cat is ill or in pain, it may also purr. Whether it's a kitten or an adult cat, and regardless of the situation, a purr can often be a sign of a respiratory infection.

Pet doctors' tip: To learn more about the reasons behind a cat's purring, you can read the article "What Are the Reasons for a Cat's Purring Sounds?"