"She just disappeared down a squirrel hole I thought, and didn't come back," Guymer said.
"I thought somebody had maybe just grabbed her and taken her home," she said.
On Wednesday, as Guymer put up missing dog flyers in her neighborhood, she noticed a woman listening near some rocks.
"She could hear a dog whimpering, and I knew it was Fuji," Guymer said.
Lifeguards arrived and spent the next six hours trying to free the dog, which was stuck in a small space among the rocks. They used oil to try and slide her out but that didn't work. They also brought in a fiber optic camera to see exactly what position she was in.
Finally, at about 9 p.m. lifeguards along with a veterinarian were able to pull her out.
"I'm so grateful to all of these wonderful men, just really really happy," Guymer told NBCSanDiego. Fuji was taken to a local vet office for observation.
Despite being a little dehydrated and hungry, she appeared to be just fine.