Horses come in all sizes big and small. Thumbelina is a miniature sorrel brown mare that is only 17.5 inches tall! Big Jake is aptly named, as he stands nearly 83 inches tall. Even more amazing, there are over 350 different breeds in the world divvied up by size, and range from every color almost imaginable. Though I am still looking for the naturally hot pink horse out there, and I will succeed.