I bought a dog whistle that emits a high-pitched tone only dogs can hear to help train my puppy.

The trainer carried several dog whistles in his pocket to call the puppies during practice.

Accusations of dog-whistle politics have surged as several campaigns increasingly rely on subtle phrases to signal controversial ideas to a limited group of voters.

Many voters were unaware that the candidate's references to 'traditional values' were actually examples of dog whistle politics.