PupWindsurfers came upon a female dog struggling against the current in the cold waters of San Francisco Bay on Monday evening. They hoisted the dog onto their boards and eventually flagged down passerby Adam Cohen, who is caring for her until the owner can be found. Cohen took the dog to the Berkeley Dog and Cat Hospital where veterinarians looked for but didn’t find a microchip. San Francisco Chronicle (free content) (8/13)

The tale of how the paddling pup pulled from the middle of San Francisco Bay got there and who owns her remains a puzzle, but more details have emerged about her rescue by a pack of windsurfers and a boating commuter.

The dog, a black pup that appears to be a Labrador mix or a Mastiff, was pulled from the chilly bay waters about one-quarter mile west of the end of the old Berkeley Pier – a good two to three miles from shore – by windsurfers who spotted her struggling in the water Monday evening. They handed her off to Adam Cohen, a Berkeley engineer who commutes to and from San Francisco in an inflatable boat, who her took her to his home to recover.

On Tuesday, the dog was taken to Berkeley Dog and Cat Hospital to see if she had an embedded chip that might identify her owners. She didn’t, and rather than turn the dog over to an animal shelter, Cohen and his family are taking care of her at home while hoping her owners show up.

The Berkeley Dog and Cat Hospital is helping with the search for the owners. Anyone who thinks they may know the dog’s owners is asked to call Katie Corrigan at (510) 225-4545.

The dog, who was wearing a collar but had no tags, seemed to be recovering nicely, said Lisa Grodin, Cohen’s wife.

“The dog follows me everywhere,” she said as the dog licked her. “She is so sweet. She’s lovely.”

While there have been plenty of calls from reporters and people interested in the dog and her story, Grodin said there were not yet any leads to her owners or clues as to how she ended up apparently swimming toward Angel Island in the cold, choppy bay.

The identity of the windsurfers who spotted her did emerge Tuesday, however. Ed Coyne, 62, a real estate investor from San Rafael, and John Newman, a San Francisco attorney, were windsurfing off Treasure Island about three miles west of Berkeley and four miles east of Crissy Field when they spotted a smallish black creature swimming.

“At first, we couldn’t tell whether it was a baby seal or what,” Newman said. “Then we saw it was a dog.”

Coyne said the dog kept swimming against the tide, and in choppy waters, but was struggling.

“She was completely exhausted,” he said. “Waves were coming and she’d get pushed under, then push her head back up and keep swimming.”

Coyne jumped into the water and called out to the dog but couldn’t get her attention. He got back on his board, circled in front and grabbed her by the scruff of the neck. He placed her on the board, where she sat shivering but seemingly grateful to be out of the water.

Soon, nearby windsurfers gathered, keeping the dog out of the water while they used a radio to call the Coast Guard.

After waiting for about an hour, they flagged down Cohen, and called off the Coast Guard, helping lift the dog into the boat and to safety.

“Ed was determined to save and rescue that dog,” Newman said. “On Monday, he was that dog’s best friend.”

Michael Cabanatuan is a San Francisco Chronicle staff writer. E-mail: mcabanatuan@sfchronicle.com Twitter: @ctuan

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