After immediate blood tests came back showing nothing, the veterinarians were baffled.
Further testing revealed Ruby had "extremely high" levels of sodium, and the cat had been ingesting salt by licking a Himalayan salt lamp in the home.
Sodium poisoning in cats and dogs in extreme cases is life threatening and can cause loss of coordination, excessive thirst, tremors, coma, seizures, vomiting and diarrhea.
"This is usually more common in dogs so this was a huge shock, and their first case they have seen with a cat," Smith said in her Facebook post.
She advised pet owners to take extra care, as the lamps are attractive to animals and can cause death.
Smith's warning about salt lamps was shared as a warning for pet owners, into a Facebook community group, by the Rose Avenue Vet Hospital in Coffs Harbour in New South Wales.