FeralHeart is awesome and I love it, and I would reccomend both, both FeralHeart and the one I would like to mention. It is called WCRPG. Warrior Cats Roleplay Game, and it doesn't just focus on cats, I have seen more than one dragon on there. FeralHeart is awesome too, I love both. I couldn't sacrifice either one for the other. If anybody is interested, my username is Yellatrophy, and it has more than just the four clans. But it requires a little HTML to make decorated posts.
Off-topic note: Sorry for being inactive. I am really busy.