the MLP character's are just trying to say it's the year of the snake. them being ponies (which grow into horses) isn't really a year of the horse in this picture. the top shows a snake in the form of the number 2 and i believe the chinese writing says something about year of the snake. the title for this picture also says year of the snake and this picture was submitted in february 9, 2013. not 2014.
the artist is just a big fan of MLP. hell, someone could draw tony the tiger (they're greeeeeeat!) with a sign saying year of the horse but that doesn't mean it's the year of the tiger.