7. Boston Terrier

If you prefer a watchdog that alerts selectively rather than barking at every passing breeze, the Boston Terrier is an outstanding choice. Weighing between 12 and 25 pounds, these smooth-coated dogs combine high intelligence with a stable, discerning temperament.

Boston Terriers monitor home activities closely with wide, expressive eyes and erect ears. Unlike more vocal terrier breeds, a Boston Terrier typically barks only when something genuinely unusual occurs. Their measured approach makes their alert call reliable and easy to interpret.