i hope none of this has already been said
1. tail motionslike wagging, have ur tail stick up as ur walking(like cats do) stuff like that
2. cub/pup/kit effects ok say ur chara has a cub kit or pup with them, wheater its theres or there lil sib or something i think it would be cool if u could carry them it your mouth. now oviously u'd have to have the other players permission so u could have it to where u click on the other chara and select pick up(if they smaller than u) and then on their screen they'd see a box tht pops up saying "blank has requested to pick up your charater" then has the options accept or decline.
3. actions/noises/emotes ok i have i few ideas. howling, growling, roaring, purring, hisssing, barking, meowing.
but you could attach them to actions/emotes. like press howl and your charater thow back its head and howls. some ations could be like streching and digging at ground(canines) stuff like that.
4. non-player animals wouldnt it be kool if their were squirrles, birds, rabbits, deer, ect. and stuff running around?! and itd be even kooler if u could chase then or actualy hunt them. that way when your rping you can actualy catch and bring food back for your pack/clan/tribe
thts all i can think of at the moment. i will post if i have any more.