This information is hard to find, probably because there were numerous individuals of Spanish and Latin American descent who graduated vet school without fanfare. Until the last quarter of the 20th century, Hispanic heritage was not necessarily tracked for individuals applying to or graduating from vet school in the United States.
Of course there are, just like in any other profession.
The very first veterinarian in Hawaii was Doctor McCoy. He was the very first veterinarian in Hawaii.
Of course he's Hispanic. He was the first Hispanic to ever play baseball.
Though there have been Hispanic astronauts, there has never been a Hispanic on the Moon.
Ellen Ochoa was the first Hispanic woman to travel to space in 1993.
She was the first Hispanic on television
She was the first Hispanic on television
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Sally was the first American women to go into space. She is definitly not hispanic.
The first man in space was Soviet cosmonaut Yuri Gagarin, as far as I know, he was Russian, not Hispanic.
First Hispanic governor of a U.S. state: Ezequiel Cabeza de Baca (New Mexico, 1917)
Luiz Alvarez was the first Hispanic to win the Nobel Prize in the year 1869
The co-star of I Love Lucy, Desi Arnez was the first Hispanic man to star on a regular TV show. Whether he was THE first Hispanic man to simply appear on TV has been lost to history.