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Sorry for the late response. It should show up if you have it in the same directory as the program file. Maybe try restarting Arduino. If that doesn't work let me know and I'll look deeper into it.
On the contrary, although it outputs around 40khz (which is indeed in the dog's hearing ability although it's at the very high point) the bursts are extremely small and directional. Unless the sensor is pointed directly at the dogs ears (which it is not) they will not be able to hear the sound since even a quiet room will cover up whatever indistinguishable frequencies may be redirected toward the dog.
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Arduino Frequency Detection
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