How to find moos kit?
Once you become a warrior, talk to Moonheart. The light gray one in the clearing with no dens/trees. She'll tell you about Mosskit. Find the moss ball in the warriors' den (The middle den) and place it on the X by the water. (All the way to the left) Wait until it's really dark then come back. She'll be there named Rogue.
Being the cat with the red tipped ear, pale gray fur and white paw named Sliver helps a lot. (It's an easter egg that gives you 222 rep. All you have to do is patrols and become a warrior) If you have any questions feel free to ask!