She may be shorter than a set of cricket stumps, no bigger than the wheel of a car and tinier than a rocking horse.
At a mere 22 inches Peggy Sue is even smaller than many of her fellow American miniature horses.
But despite her dwarf-like size the six-month old, who will grow no bigger, is still the mane attraction wherever she goes.
Peggy Sue has such a great personality,' said her owner Jill Jones, who took her in soon after she was born.
'She loves people and even though she is the smallest, she can give any of the other horses a run for their money.'
Peggy Sue is the 45-year-old's 13th miniature horse.
She got her first seven years ago and has continued to add to her stables in Morpeth, Northumberland, ever since.
'I heard that Peggy Sue was in need of a home and when I met her it was a case of love at first sight,' she added.
'She has a fabulous personality, is so loving, likes people and is really cheeky.'
Mrs Jones, a property developer who owns the Supreme Dream Miniature Horse Team, uses the horses to raise money for charity.
She also shows her miniature horses around the country and earlier this year two of them were placed second and third at the Miniature Horse of the Year show.
They all tower over Peggy Sue who measured just 15 inches from the ground to her mane when she was born.
At the average height of a Labrador, she also weighs just six stone and eats just two handfuls of grain a day - compared to an entire bucket for an average horse.
Peggy Sue is one of the smallest miniature horses in the UK.
But at a stud in the southern Australian state of Victoria the world's tiniest measures up at a mere 15 inches tall - about the size of a week-old lamb.
Originally bred as pets for children of royalty during the 16th century, miniature horses are generally considered to be friendly and affectionate.
Nowadays they are mainly kept for showing. The Miniature Horse Association, which was founded in America in 1978, dictates that the horses' height must not exceed 34 inches.