WEST CHESTER, Pa., (CBS) — It’s one of the most watched videos online right now – a dog that went blind, overjoyed to see his family again after re-gaining his sight.

That video has been seen around the world, 2.5 millions times and counting.

On Thursday night, Eyewitness News sat down with the West Chester family who shot the video and shared the story behind the video.

“Dogs love you, but I’ve never seen a dog’s tail move like that,” Malcolm May recalled.

Malcolm’s wife, Peggy, added, “We were just overjoyed, he saw us. That’s the most important thing.”

The Mays introduced us to Duffy, the 10-year-old Irish Terrier, they rescued more than nine years ago and the same dog that became an internet sensation, virtually overnight.

“He has no idea what’s going on, all he knows is we take him in a car and he just stands there with all these strangers. People try to come up and try to pet him and they take his picture,” The Mays explained.

We’re told, Duffy was born healthy but he lost his eyesight last year due to Diabetes and in January, doctors at the Veterinary Referral Center in Malvern told the Mays they were running out of time.

“We had to pull the trigger, it was one of those decisions where it was is it going to work or not, it was a narrow window with dogs get full blown diabetes and with Dr. Beale and Dr. Kumrow were right there onboard with us,” Malcolm explained, “It was like we got a new dog when he had the surgery.”

The video, was in fact, shot in January immediately following Duffy’s eye surgery. It was shot for their son, Ben, teaching English abroad. Just last Saturday, Ben May decided to post the video on YouTube.

“Duffy didn’t get to see him so he wanted to see that and rest is history,” Peggy said, “Look at what we have now. It’s like it never happened.”

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