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Ancestry/Breed. Sometimes a dogâs propensity to howl is genetic. Certain dog breeds tend to howl more than other dog breeds; maybe itâs the olâ wolf in their ancestral family tree. Malamutes, Eskimo Dogs, Huskies and many hound breeds seem to be genetically predisposed to howling. Some breeds actually just enjoy howling like humans enjoy karaoke.
Some sirens sound like the faraway howl of a dog (at least to other dogs), and the dog may merely be being helpful by sending up a response. One howl often leads to another, which is why you may hear a whole neighborhood of dogs howling in response. Continued... http://www.wisegeek.com/why-do-dogs-howl...f you want to train him out of it, use treats. When a siren sounds, make another, different loud sound to distract him. Not a negative, yelling sound though-just something to grab his attention. Then say a command like quiet and then give him a treat for being quiet.