DEL MAR — Michele Arthur and Ruben Islas own a horse who won a race on Kentucky Derby weekend at Churchill Downs, and another who ran on Breeders’ Cup Friday at Del Mar.

But neither horse was part of the main event.

There will be no FOMO on Friday, though, when a 2-year-old owned by the San Diego friends — Islas and Arthur’s husband, Jules, are business partners — starts in the $2 million Breeders’ Cup Juvenile at Del Mar.

“Right down the street,” said Islas, who grew up in Barrio Logan and went to St. Augustine High School and UC San Diego. “That’s amazing.”

“It’s a dream,” said Arthur, a San Diego native who spent much of her childhood here. “It’s actually like I’m walking in a fog right now.”

Neither Arthur nor Islas owned a horse — or really thought about owning a horse — until

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