aullar

To howl — the sound wolves and dogs make (el lobo aúlla a la luna), and, by extension, a person howling in pain or anguish. Note the stress shift: the u takes a written accent in most present-tense forms (aúllo, aúllas, aúlla).

• Los lobos aullaban toda la noche. — The wolves howled all night long.
• El perro aúlla cuando se queda solo. — The dog howls when it's left alone.
• Aulló de dolor al torcerse el tobillo. — He howled in pain when he twisted his ankle.

Forgetting the required accent mark on stressed forms — aullo (without the accent) is wrong; it must be aúllo, aúllas, aúlla, aúllan to show the stress falls on the u.

• film Aullidos — The Spanish-language title used in Spain and Latin America for Joe Dante's 1981 werewolf horror film The Howling, built directly on aullar/aullido (howl).