It sounds like you want a clone of Foopets. There are a lot of good sites out there that let you breed your pets but no one has interaction like Foopets does currently. If you want to breed wolves, try Wajas.com. If you want to breed cats, try Felisfire.com. Both are good sites.
You could try www.creaturebreeder.com it lets you breed different animals it is also really fun!
naruto ninja storm
weeworld is a fun game that lets you do almost what u want, meez lets you do anything :)
Well......Minecraft lets you build your world the way you want, so, yeah check it out.
actually, it's Bella sara. and the site's name is [www.bellasara.com]. (without the brackets, of course!)
yes it is called the wii virtual. look it up.
Smallworlds.com
Well lets see sparkcity world is a virtual world for girls only.
it lets them interact with others
there is dragon fable....but you have to find an egg
You can create a virtual pet site at myvirtualpetsite.com You can customise your site/world to your tast.
There is an iPhone app that lets one send virtual flowers. One app is called Flower You. It lets one choose a different kind of flower and send them to others by email.