I originally created these for someone who'd had an IRL cat that didn't meow and wanted to recreate that in petz. These files should maintain non-bark/meow sounds like purring or sneezing. You can also use them if you have a petz that makes sounds you find annoying. Put the 'silent' directory for Dogz in resource/Dogz and for Catz in resource/Catz.
Then in any cat you want to make silent, use Lnz Pro and remove the current
[Sounds] entry and replace it with