A tiny horse called Acer is believed to be Britain’s smallest steed at just 22 inches tall. Acer lives with his owner Maureen O’Sullivan at her Miniature Horse Farm in Corringham, Essex. The three-year-old sleeps in a small stable, plays in the field and even wanders around the family home. The little equine is best friends with a Labrador called Demon, who stands inches taller than the tiny horse. Acer was born with a rare condition called dwarfism, which means he didn’t grow properly in the womb.