Dogs always bark for a reason. Studies have even shown that different barks express different emotions (though a few breeds, like the poodle and the American Staffordshire Terrier, appear limited in their vocal repertory). The more high-pitched, atonal and repetitive the bark, the more indicative it is of a dog under stress.
A recent study of 84 dogs from nine breeds, including Poodles, Weimaraners, American Staffordshire Terriers, German Shepherds, Alaskan Malamutes, Bull Terriers and Muensterlaenders, recorded as many as a dozen variations of some types of barking among the dogs. Subtle variations even corresponded to “dialects” which were used by the dogs in identical situations at different times.
Although there is no difference in the percentage of excessive barkers between males and females, males tend to bark less once neutered because they’re less territorial. There’s also a breed difference in barkers; Many Beagles, Terriers, and some herding breeds tend to bark more – not surprising, since this is one of the characteristics for which they were bred.
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