Here's why:
* Scientific names classify species: Scientific names are used to identify specific species, like *Equus caballus* for the domestic horse.
* Pinto describes coat pattern: Pinto refers to a horse with a coat pattern of white and another color, like black, brown, or bay. This pattern can occur in various horse breeds.
So, while you might see a pinto horse of a certain breed, "pinto" itself isn't a scientific name.