The owners of Fluffy, who live in Kalispell, Montana, in the far northwest of the state, found her in a snow bank on January 31 - unresponsive, with her fur matted with ice.
When she got to the clinic, her temperature was below 90°F, said Dr. Jevon Clark. A cat's normal internal body temperature is 101 degrees. China Corum, used heating pads and a heated cage to bring Fluffy's temperature up until she gained consciousness later in the afternoon.
Despite her harrowing encounter, clinic vets told KULR that by the evening, Fluffy was seemingly back to her normal self and now appears to be recovering.
It was only after Fluffy was taken to an emergency room a few hours later that she began to show real signs of recovery.
"She's a little bit crabby, and so that's how we knew things were probably gonna be okay, when she started getting crabby with us, that things were all right", Dr Clark said.
"And then they realised "oh my gosh, she's not moving". Her temperature was very low but after many hours she recovered and is now completely normal.
"She was frozen", said Andrea Dutter, executive director of the Animal Clinic of Kalispell.
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On Tuesday, the animal hospital posted the good news of Fluffy's recovery on Facebook.
Dr Clark said Fluffy's owners didn't do anything wrong.
"I suspect that something traumatic happened", Clark said.
Fluffy's body temperature was so low it did not even register on a thermometer.
"Either something fell on her or she fell or something chased her and she got injured ..."
The 3-year-old cat was mostly an outdoor cat that the owners "acquired" when they moved into their new home. "Fluffy is fantastic!" the clinic said.