A crowd gathered and tried to get Nellie's attention, to no avail.
"I don't think she even heard us calling," Nellie says. "Several people were yelling and trying to get her attention, but I don't think she even heard us at that point."
Nellie's summer dip had become a nightmare.
By the time Adam Parker arrived on the scene, her owner was frantically calling the local yacht club hoping someone might pick up her dog with a boat.
'I overheard a guy saying that Nellie had been swimming for close to an hour, and that people were calling the yacht club looking for help," Parker, who had been walking his own dog, Otis, tells The Dodo.