Estrada, who lives in Boulder Creek in Santa Cruz County and works in Livermore, said the dog-friendly beach community was covered in fliers about the missing dog and had even sent out search parties canvassing the area looking for the Cole family's beloved dog.
"Ten of our neighbors joined our family in the search that lasted until late that night", Beth Cole, Sage's mother, told The Dodo.
Things took a turn on Saturday, when a neighbor named Dan Estrada was out on a hike and spotted something. InsideEdition.com's Keleigh Nealon (https://twitter.com/KeleighNealon) has more.
Sage is reunited with owner Beth Cole and son, Noah, in the back of Estrada's jeep. Stories of Sage's disappearance soon spread on social media.
"The very moment I saw Sage, my heart fell into my stomach and I was overwhelmed with sadness, because I knew at that point it would be a body recovery", Mr Estrada said. "Then I looked closer, and I saw that it was Sage".
One more night by the stream and she would probably wouldn't have survived.
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When the pooch lifted her head, Estrada jumped in the stream to help her.
That's when Lopez cried: "Dude, she's alive!" Luckily she was not dehydrated because she was drinking from the stream. I realized that there was no way she was going to be to walk on her own.
The Cole family asked members of the local community to help find their missing dog, but as the hours and days passed, they were increasingly fearful that Sage would not make it.
The two friends made their way down to Sage and as they neared her, she apparently heard Estrada's two dogs and lifted her head a little.
He said Sage was too weak to move on her own and her current location was about to turn risky. "Everyone was crying", Estrada said. Estrada says if dogs could smile, Sage was smiling all the way home.
As a result, when Sage's family offered Estrada a reward, he declined it. He insisted that the money be donated to an animal welfare group.