Dad makes tots brawl while he watches.

This guy's never gonna win any Dad of the Year prize.

Pedro Delgado, 26, was arrested after he made his 4-year-old and 6-year-old sons fight while he watched. Yes, FOUR and SIX. They were allegedly told to use closed fists, kicks, and knees to the body.

The children described the fighting like "UFC [Ultimate Fighting Championship]."

When they refused to continue fighting, Pedro allegedly hit the 4-year-old in the face with a sandal. When his mom noticed the bruising, she called the cops.

Now Pedro's been arrested, and could face five years in prison.

Five years just doesn't sound like enough ... but we're glad this guy is behind bars where he belongs. Who could do this to a child? It's bone-chilling.