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September 30, 2010. Excessive stomach noise in a dog is called borborygmus. It is usually accompanied by flatulence, belching, abdominal distention and constant restlessness. Borborygmus is more common in larger breeds, such as German shepherds or Newfoundlands, but can occur in any individual dog.
The frequency of most dog whistles is within the range of 23 to 54 kHz, so they are above the range of human hearing, although some are adjustable down into the audible range. To human ears, a dog whistle makes only a quiet hissing sound. The advantage of the dog whistle is that it doesn't produce a loud irritating noise for humans that a normal whistle would produce, so it can be used to train or command animals without disturbing nearby people.