what makes cats purr
How Cats Purr. The purr a cat makes is part of the inhaling and exhaling of natural breathing (Meow sounds happen only during the exhale). It is caused by the opening and closing of the space between your cat's vocal cords (called the glottis).The laryngeal muscles cause the opening and closing action.hile we think of cats purring when they are happy and relaxed, cats also purr when under stress, frightened, sick, or in pain. Female cats often purr when in labor. Cats have been known to purr while dying. It is believed that they may do so in an attempt to calm themselves.