How do you "test" that which you can neither see nor hear? The reaction of the "other"?
How do you invent it in the first place?
How do you discover what a dog's hearing is like in the first place?
Are all DOG WHISTLES geared for the same level of hearing in dogs?
Is the hearing of every dog identical to the hearing of every other dog?
What about cats? Do they hear dog whistles? Are there cat whistles?
Do dogs hear whistles geared for human hearing?
What's the point of a whistle for animals?
