GW2 vanilla game is f2p.
Idk if you'll like it, the content isnt very much but there's also champions online. Despite being an "ok" to meh game, the character customization is real good, and you can make decent furries/anthro toons. I've seen many anthro/furry characters so you might be able to find some furry players there and probably furry guilds (called supergroups here). The only one prob tho, most of the real good furry/anthro pieces you have to buy on the zen store (real cash or lengthy farming.) Idk what else, I can only assume if the mmo has some anthro races or good character customization options with animal heads available, then there may be a chance that it'll have a furry community. Idk any furry specific mmos, but there are some furry games out there lol.
If you go to social specific ones though, there'll be better chance for fidning furry community, tho i don't think that's what you are looking for. Two im thinknig of are imvu and second life, and both seem to be catering to furries as well as ive seen them add furry options when u make a new toon/account, and i never saw that before.