Here's a post on how to create a custom masking sound for a sound-phobic dog, particularly one who is afraid of thunder or fireworks. So many products sold to supposedly help such dogs are bogus. This is simple, non-sexy biophysics.
eileenanddogs.com/blog/2025/06...
There are lots of options for masking scary sounds in your dog's environment. Here's one you may not have thought of.