Naturally "barkless" Dog Breeds
Compared to most domestic dogs, the bark of a dingo is short and monosyllabic. During observations, the barking of Australian dingoes was shown to have a relatively small variability; sub-groups of bark types, common among domestic dogs, could not be found. Furthermore, only 5% of the observed vocalisations were made up of barking. Australian dingoes bark only in swooshing noises or in a mixture atonal/tonal. Also, barking is almost exclusively used for giving warnings. Warn-barking in a homotypical sequence and a kind of "warn-howling" in a heterotypical sequence has also been observed. The bark-howling starts with several barks and than fades into a rising and ebbing howl and is probably, similarly to coughing, used to warn the puppies and members of the pack. Additionally, dingoes emit a sort of "wailing" sound, which they mostly use when approaching a water hole, probably to warn already present dingoes. According to the present state of knowledge, it is not possible to get Australian dingoes to bark more frequently by making them associate with other domestic dogs. However, Alfred Brehm reported a dingo that completely learned the more "typical" form of barking and knew how to use it, while its brother did not. Whether dingoes bark or bark-howl less frequently in general is not sure.
The now extinct Hare Indian dog of northern Canada was not known to bark in its native homeland, though puppies born in Europe learned how to imitate the barking of other dogs. When hurt or afraid, it howled like a wolf, and when curious, it made a sound described as a growl building up to a howl.
The Basenji of central Africa produces an unusual yodel-like sound, due to its unusually shaped larynx. This trait also gives the Basenji the nickname "Barkless Dog."
Read more about this topic: Bark (sound)
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