Think your dog companion's bark vs your headache is OP? Try this little mod! Comes in two flavours: randomized decreased volume that's very quiet (default) or totally silenced. This ONLY effects their idle sounds.

Installation: Just drop it in your Skyrim folder!

Note: RandomizedQuiet is -15db - (random number between 10-20), and is intended for headphone usage.

Link: http://www.skyrimnexus.com/downloads/file.php?id=1579