I keep hearing about Dappervolk... and a few times I've heard about another upcoming avatar site that I can't remember the name of. I know it has taller avatars that I'm not interested in right now. Dappervolk looks real cute, though! I'm not really to into pet sites, but the art is super nice!

Voltra is doing pretty well so far, in my opinion. Flying through some goals with post counts/users joined. But it can be pretty hard to judge sites right off the bat sometimes. Some of them still end up closing down. I do know the owner, though, and he's pretty passionate. It may seem Fork-like, but I don't think he's on the team?