Originally posted by Dampback:

I dont tame aimals for this reason, the animal sound effects in this game are not only annoying garbage but happen way too frequently and can be heard from way to far away

Tamed boars are quiet until you pet one and even then it just lovingly grunts a little :) Only time I have found them to get noisy was during my early taming days and that was always down to having a lit torch too near to them (frightens them). Remove the torch and peaceful silence resumes :)