What is a scientist called who studies horses?

There isn't one specific term for a scientist who studies horses. However, depending on their specific area of focus, they might be called:

* Equine Veterinarian: A veterinarian specializing in the health and well-being of horses.

* Equine Scientist: A broad term encompassing scientists studying various aspects of horses, including their biology, behavior, physiology, and genetics.

* Equine Nutritionist: A specialist in equine diets and nutrition.

* Equine Ethologist: A scientist specializing in the behavior and social interactions of horses.

* Equine Geneticist: A scientist studying the genetics of horses, including breeding and genetic disorders.

* Equine Paleontologist: A scientist studying the fossil record of horses and their evolution.

The specific title will depend on the scientist's particular field of research and specialization within the broader field of equine science.