I had been recommended a "Pet Corrector" product for training our dog, and it works really quite well. However the cost of what is really a very small can of air with a custom nozzle is quite absurd and it runs out really quickly. So I found some larger cheaper cans of compressed air (https://smile.amazon.com/dp/B07QJY6MKD) and made my own nozzle.
I've added a bar across the nozzle so that the jet of air doesn't go straight at my pet. The cone shape does also seem to increase the audible noise of the air, it could easily be improved to be even louder I imagine.
Print settings were 0.2mm and 20% infill, does not require any supports or brim. Just make sure to orient it face down.