Why do cats growl
Cats growl to signal offensive or defensive aggression, usually as a warning before an attack to protect territory or themselves from threats.
Cats growl to signal offensive or defensive aggression, serving as a vocal warning intended to deter a perceived threat without physical contact. This sound is almost always accompanied by specific body language, such as flattened ears or an arched back, and indicates that the cat feels cornered or challenged.
Growls are a warning, not a greeting
The growl belongs to the same category as hisses and spits, which are sounds produced with the mouth held tensely open. Unlike the purr, which can signal contentment or pain, or the meow, which is largely a domestication trait used to solicit food or attention from humans, the growl is a serious signal of conflict. It is used to scare intruders away from territory or to defend against other species, including dogs, and often precedes a physical attack if the warning is ignored.
The mechanics of the sound
Phonetic studies from 1944 classified growls as sounds produced with the mouth held tensely open in a fixed position, similar to snarls, hisses, and spits. This places them in a distinct acoustic category from murmurs like purring or sounds like meows where the mouth opens and closes. The growl is a low-frequency, often guttural noise that functions as an auditory threat display, designed to make the cat appear larger and more dangerous to the opponent.
Body language accompanies the noise
A growl is rarely an isolated sound; it is part of a coordinated visual and auditory display. When a cat growls, it typically adopts a specific aggressive posture: the hind legs stiffen, the rump elevates, the back remains flat, and the tail hairs are erected. The nose is pushed forward, and the ears are pulled back slightly. This posture is an attempt to elicit deference from a competitor, allowing the cat to avoid a fight that could result in injury from claws and teeth.
Contexts for aggressive vocalization
Cats use growls in specific behavioral contexts, primarily during disputes over territory or food, or when experiencing acute stress or pain. Research categorizing vocal responses notes that growls occur before or during threatening behaviors, such as when a cat feels its space is being invaded. While kittens as young as two to three weeks may hiss and spit when first handled, the growl is a more developed warning signal used by cats of all ages when they feel threatened.
When the warning fails
The growl is a defensive mechanism intended to resolve a conflict without violence. If the hiss and growl warning does not remove the threat, the cat may escalate to an attack. This escalation is most likely when escape is impossible, such as when a cat is cornered. In these situations, the cat may resort to varying degrees of aggression, using both its vocal warnings and physical defenses to protect itself.
Distinction from other vocalizations
It is important to distinguish the growl from other sounds that might sound similar but have different meanings. A howl or wail is tonal and used in threatening situations, while a yowl is similar to a howl but longer. A caterwaul is a loud, rhythmic sound associated with mating, not aggression. The growl is distinct in its function as a direct threat signal, often combined with a snarl, and is fundamentally different from the low-frequency rumble of a purr, which can occur during painful moments but is not a threat.
Understanding that a growl is a final warning rather than a playful sound is crucial for human safety and feline welfare. Ignoring this signal can lead to a bite, as the cat has already communicated that it feels threatened and is prepared to defend itself.