She said: "When I was told we got such a tiny baby on our farm I did not believe it.
"And then I saw it, it was as big as a cat. I was so happy, it is a miracle, the most important thing is not that it is so small, but that it is well-built.
"He is very friendly, and he behaves like a star. Very at ease. He is one unique fella."
Miniature horses are usually the size of a small pony and do not grow taller than 97cms.
Gulliver is thought to be the smallest horse in Europe and America, and possibly the world.
He is now one month old and is able to be picked up by visitors.
Chistyakova said there are horses born with dwarfism whose features are out of proportion, unlike Gulliver who was perfectly formed.
She said: "There is a concept of "dwarfism" in horse breeding. These animals usually have really large heads, crooked legs, a humpbacked back, an incorrect bite, a short neck."