The saddled-pigs don't work in 15w51b. They can't be steered even with a carrot on a stick.

I had created a survival world in Minecraft where I would unlock every achievement in the game. When I was preparing to unlock the achievement When Pigs Fly, I got on saddled-pig while holding my carrot on a stick. But when I tried to move around using the pig it just stayed still! I checked my hot bar to make sure I was holding the carrot on a stick and I was! HELP!