Definition of howls:
(v) :
To utter a loud, protracted, mournful sound or cry, as dogs and wolves often do.
(v) :
To utter a sound expressive of pain or distress; to cry aloud and mournfully; to lament; to wail.
(n) :
The protracted, mournful cry of a dog, wolf or other canid; also of other animals.
(n) :
A prolonged cry of distress or anguish; a wail.
(n) :
Any similar sound.
(v) :
To make a noise resembling the cry of a wild beast.