Basenji

The nearest thing to a barkless dog, thanks to an unusually shaped larynx, but not a mute one. Expect the "baroo", a sound somewhere between a yodel and a howl, plus whines, growls and the odd scream when thwarted. Volume is rarely the problem. Boredom is: an under-exercised Basenji chews, climbs and escapes with real ingenuity, so the quiet comes with a daily workload.