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It must be fun to work at the casting agencies for these movies. Before you even have a script, you just take out your rolodex and call every single name in it, and ask "Hi, would you like to do a voice for a talking animal this year?"
And that's all you have to say, because they all already know the drill: if they say yes, they go out to voice some lines for three hours, then they go home and a dump truck full of money is driven up to their house.
If they say no, then they can just wait till next year.