there is clubpenguin,neopets,happydog,
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Well, you could play Webkinz if you wanted to...
Club Penguin, Webkinz, Runescape, Habbo Hotel, pixie hollow.
Club Penguin, Pet Pet Park, Webkinz, Neopets
Webkinz isn't really free, you have to buy the plush toy. But free websites like that are neopets, and clubpenguin. Probably more but I think these are the best ones.
There is no Webkinz Nintendo DS game.