A new horse

Yet another animal was born next door. This time it is a little horse. The mare looks a bit tired, she's been popping out little 'ns every year for nearly a decade I've been told.
All the other animals (the four donkeys, four horses and a cheeky black pony) kept me awake all night, making irritating noises and galloping all over the place. Just being obnoxious really.
I think there's something wrong with its legs, it walks all funny and unsteady. Not that I know anything about horses. It just looks as if its got too much leg for its own good.