Instructions
Look at the device you will be using to record the dog whistle. If this is a answering machine, look for the "Record" button. If the recording is done through a phone call, you might have to call the voice mail and follow the prompts to rerecord the voice recording. Read the manual of your device if you have it.
Have the dog whistle nearby to blow once you begin the new recording. If the recording is set to go longer than you can blow a whistle, consider downloading a dog whistle audio file from the Internet. In this instance, you would need to play the voice file at the same time you begin to record over your voice file.
Review the recording to make sure it has recorded the dog whistle. Rerecord if needed.
How do I Change a Voice Recording to a Dog Whistle?
A dog whistle emits a sound at a frequency above most human hearing. Dogs hear at a frequency level much higher than humans and can hear the dog whistle clearly and easily. A dog whistle is used for training animals. Changing a voice recording to a dog whistle sound might not be clearly audible to humans who hear the recording but dogs will clearly hear the sound frequency.