What is the meaning of a dog's howling?

Howling is shouting, and the howling of a dog is its barking. It has been reported in the Hadith that the howling of the people of Hellfire consists of intense sounds. It was also reported from the Prophet (peace be upon him) that if a Muslim hears the barking of dogs and the braying of donkeys at night, he should seek refuge with Allah, because they see what we do not see.