It's hard to talk about, work with, or even think about dogs without broaching the topic of barking. Even the absence of barking is frequently noteworthy.

As a matter of fact barking can be a very big issue. The sort of issue can lead to dogs being rehomed or...worse. Coppinger and Feinstein ("Hark! hark! The dogs do bark ... and bark and bark"; Smithsonian 1991 - can't find a link.) once recorded a dog barking for seven hours straight......