The office of Franklin County Sheriff Zach Scott said the body of Kyle Miller, 21, was found in Darby Bend Lakes in the Prairie Oaks Metro Park in Hilliard during a second day of search efforts Sunday.
Miller and Austin Gifford, 19, had been kayaking at the park Saturday when they entered the frigid water to try to save the dog.
Gifford tried to rescue Miller before witnesses pulled him from the water. He had been taken to a hospital, treated and sent home.
The dog did not survive.