Two Great Danes died Sunday evening in a houseboat fire in Marathon, the Monroe County Sheriff's Office said.
Firefighters were already on the scene, 35 Sombrero Beach Blvd., and attempting CPR on one of the dogs when Deputy William Daniels arrived before 6 p.m.
Neighbors initially saw the fire and attempted to extinguish it with fire extinguishers and hoses.
The boat's owners said they'd been working on it all day making repairs and had left shortly after 5 p.m., said Deputy Becky Herrin. They said they had no idea how the fire started.