Pink pony with horns

There once was a pink pony with horns,and on his horns grew thorns.
he'd grown up in the city, since he was itty bitty.
he now was five years old, and to nobody would he be sold.
that made him very mad, he was a pony without a dad.
he wished he didn't have hooves, at night he secretly dance on roofs.
one day a person said hi, and made an offer to buy. he was so excited he almost cried, but the next day the guy changed his mind.
now poor little pink pony was very sad. why did his life have to be so bad?