Dogs survived CRT monitors and TVs, so I'd assume their behaviour would be known in that instance. I'm unlucky enough to hear 15 kHz, and you'd easily hear any

Dogs survived CRT monitors and TVs, so I'd assume their behaviour would be known in that instance. I'm unlucky enough to hear 15 kHz, and you'd easily hear any TVs turned on two storeys away. CRT ultrasounds used to be unbearably, migraine-inducing loud. I assume laptop speakers wouldn't be anywhere as bad.