I've never heard that, like fireworks homeopathy or something? Where did you hear that?

Here is the first non-Reddit link from Google: https://www.royalkennelclub.com/health-and-dog-care/health-d...

> Getting your dog used to loud and sudden noises can make them more relaxed and less reactive when the fireworks outside get going. There’s a good range of CDs and playlists of fireworks, storms, and loud noises available, and playing these can really help your dog desensitise to the noise.

> Start by playing the sounds at a low volume, and as your dog gets used to it you can slowly increase the volume over a period of time so that they become used to the noise. This can work especially well with young dogs and puppies, and can let you nip any problems in the bud before they even arise.