The term 'PET SOUND' is a combination of three different sounds that are commonly associated with pets. The first sound is 'ARF', which is the sound a dog makes when it barks. The second sound is 'MEW', which is the sound a cat makes when it meows. The third sound is 'MEOW', which is a more drawn out version of the sound a cat makes when it meows. All three of these sounds are commonly heard from pets and are often used to describe the sound they make.