The incident happened in the hills just above Pescadero, a remote area where mountain lion sightings have become more common.
The animal took the small dog from the bed and walked out, she told deputies.
The San Mateo County Sheriff's Office says the woman reported seeing the shadow of an animal enter the room, take the small dog and leave.
The San Mateo County Sheriff's Office issued a news release to make residents aware of the incident.
But Ms Fought and her daughter are astonished that a mountain lion could have been so bold.
The predator entered the house in the 800 block of Native Sons Road through a pair of French doors that had been left partially open to allow the dog access to the outdoors. Her daughter said she knew something was wrong because of the smaller dog's bark.
Even then Fought didn't guess it was a mountain lion.
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Authorities have contacted the California Department of Fish and Wildlife to see if a follow up investigation is necessary. "Lenore did her attack barking, very vicious attack sound that she does when she's not liking something", said owner Vickie Fought.
"We live amongst these animals, but mostly, you never know they're there", Periat said. The dog's carcass has not been found, but bloodstains were found near the door - the lone signs of an intruder, Fought told CBS.
The family told CBS 5 News that years earlier, a mountain lion attacked one of their horses, which was able to escape.
Those residing in mountain lion territory are also warned to avoid attracting deer, mountain lion's main prey, keep brush trimmed to reduce places where they can hide; and consider installing motion detector lights around the house.
The sheriff's department urged area residents to lock and secure their windows and doors.
"They're very easy to find, inexpensive, light and compact", Zuno said of the devices. "Because she plays with Leo a lot, and it didn't seem normal", Catalina said.
Responding deputies found prints suggesting a mountain lion.