The puffed-up hissing and spitting display of a cat towards an approaching dog is a well-known behavior. Cats hiss when they are startled, scared, angry, or in pain, and also to scare off intruders into their territory. If the hiss and growl warning does not remove the threat, an attack by the cat may occur. Kittens as young as two to three weeks will follow hiss and spit when first picked up by a human. "Spitting" is a louder but more emphatic shitting Question: why do cats hiss?
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