May I add my opinion about the FOOD?
I'd like you all to take a look at
www.Foopets.com
I use to play it all the time, and make sure I got on everyday.
Why, you might ask?
Because it had realistic pets, HUNGER, Happiness, and games that could earn you the site currency.
Everyday, I would be sure to log on so I could care for my pets. I also would pay currency to have other users care for my pets while I was away. You would have shelters, daycares, and what not.