Hello. I remember there was a news post with link to reset pet's appetite. But I can't remember it now. Can someone please help?

You can find it here.

Thank you!

for future reference, its another room in the bathhouse.

More specifically it's in the middle of the right side of the drawing of main room with NPC Ying in it. It's a large rectangular link of the entire passageway behind the Aqua Torrent holding the weird-handled push broom.