In an extremely unusual case, a dog's blood was used to save the cat in the New Zealand town of Tauranga.
The gamble to give a transfusion of Labrador's blood to the gravely sick cat paid off with a quick recovery by the feline.
It was realised that six-and-a-half-year-old ginger cat Rory needed a transfusion late on a Friday evening. There was not enough time to find his blood type by sending a sample to a laboratory before it closed, Fairfax Media reported.
It was suspected Rory, who had bled internally, had eaten a poisoned rat or got into someone's rat bait.
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"Rory was going to die before we were going to get his blood type," Heller said.
"He was really dying before our eyes."
She talked to Rory's owners about the risks of giving the cat a blood transfusion from a dog and they decided to give it a go.
Cat-to-dog transfusions were given at times, although she had never done one before, Heller said.
Rory's owner Kim Edwards knew a friend with a Labrador, and the dog was rushed to the vets.
After starting the transfusion, Heller monitored Rory for an hour, then went home to have some dinner.
"I came back to check him after about an hour, and he was sitting up eating and purring. He responded really quickly to the transfusion," she said.