horse doctor; equine veterinarian
Refers to a veterinarian specializing in horses. The term is straightforward and not particularly formal or informal.
彼は馬医者として競走馬の健康管理をしている。
He works as a horse doctor, managing the health of racehorses.
Compound of 馬 (uma, 'horse') and 医者 (isha, 'doctor'). The reading うまいしゃ is a straightforward combination of the readings of the two components.