Yeah... !!!
I do not think the horse would actually care if it were being portrayed as mean (he's probably just wondering what's for dinner), BUT, that was not my take on the commercial at all. I think to appreciate the commerical, as some do, you have to appreciate sarcastic humor.
Every little girl wants a pony for Christmas but most of them out grow that want when they become teenagers. So, this girl finally gets the pony she used to beg for, but now she's rather have a cool cell phone. I think when she says "yeah" (he bites), she's basically wanting to end the discussion about that pony.
And, it is just a commercial. It wasn't meant to change the world, to teach proper horsemanship, or to make parents deal with spoiled children. It's just meant to make people think of Verizon cell phones.
In my opinion, it's got it all over another cell phone company who's tag line is "where you at?"