Barking is the one of the noises most commonly produced by dogs. Woof is the most common representation in the English language for this sound (especially for large dogs), other than "bark" itself. Other transliterations include ruff, arf, yap (small dogs), and bow-wow.
There are a wide range of gadgets designed to help a dog owner control her dog's disturbing barking behavior.
Collars that make a beeping sound are the most humane of all.