The Marion County Sheriff's Office took 21-year-old Nicholas Anthony Sardo into custody on Monday in connection with the acts that allegedly took place in October.
According to the sheriff's office, a witness came forward and reported seeing Sardo engaged in the sexual act in a pasture with a male miniature horse named Jackie G.
The witness confronted Sardo about what happened, and he admitted to the act, the sheriff's office said.
Sardo also allegedly admitted to a detective what happened, adding that he had sex with Jackie G. at least four times in a week.
The sheriff's office stated Sardo insisted that he wore a condom each time because "he didn't want to get a disease." He also allegedly told a detective "he knew he was wrong for what he did" and that "he was a sick man."
Sardo was charged with four counts of bestiality/sexual contact with an animal.
The sheriff's office did not specify whether the miniature horse sustained any injuries.
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