What's the deal with terriers?

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I like dogs. But why must some of them make so much noise? Take terriers, for instance. Who do they think they are fooling? Do they actually think that a convulsive fit of yelping is going to intimidate anybody? They fail to realize that the pitch of their bark is so high that the noise couldn't possibly come from anything heavier than ten pounds, or taller than twelve inches. So they are dumb. Worse, they get stirred up from the slightest sound or disruption in the environment around them and let loose for five, ten, or more minutes of relentless auditory punishment to any living thing within earshot of their racket. So what is the problem with these...things? Quite simply, mental illness.