well there is one kind of like that. its called horseland.com it sounds like little kiddish, but most times you will find adults that still play it.
what you do is you can buy horses and dogs. then you have a kennel and stables where you feed your animals. you can put them in shows, train them, and breed them.
the talk rooms are cool, many people can get on at once and everyone just talks. or if you have a horse, you can go ride and there will be other people there to talk to.
hope this is a good one for you. have fun
