Dogs howl for any number of reasons -- to communicate, to join in other noises, or sometimes just for fun. Dog lovers have noticed that certain breeds are more predisposed to howling behavior; in particular, notes Dogster, hound breeds and sled dog breeds such as the Alaskan Malamute and Siberian Husky seem to enjoy howling.
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A closer look reveals that the breeds that tend to be howlers are also identified as "ancient" breeds in the dog DNA study conducted in 2004. The study grouped 85 breeds of dogs by genetic similarity; the "ancient" subgroup shared the most DNA with wolves. There are some exceptions, of course, but there does seem to be some correlation between "ancient" DNA and the tendency to howl.

The young Siberian Husky pup in the video below is trying out his voice. At just a few weeks old, he's so adorably tiny that he sounds more like a cat at first. He works at it hard, though, and eventually gets himself up to a high-pitched howl. 

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