I have a lot experience with ultrasound for machinery monitoring. Can hear grease going into a bearing,

I can bear a tiny little relay in a multi ton transformer cabinet, it is on a card, on a motherboard, in a 1/8" thick seal cabinet with my gear.

I can hear your eyes open, your fingers running together, etc feom feet away. No real matter the noise levels from the thousands of horsepower of pumps running.

Can't pick up a voice.

Electronics can be noisy around 40 kHz.

A shovel moving gravel is noisy.

Keys rattle terribly.

When doing inspections outside, a bird walking by make a lot of noise

So yeah, cat's and dogs live in an entirely different noise level.