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Why did my cat die suddenly from very low red blood cells?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Mediumhair | Female | spayed | 4 years and 7 months old | 8 lbs

My 4 yr old cat stopped eating and drinking for 2 days and was noticeable thinner, was Lethargic and hiding from me. Took her to vet's and Cbc showed red blood cells at 5. She died within 3 hours. Why was this site sudden? She was fine a week ago now I am heartbroken beyond words to have lost her so suddenly. Blood transfusion was mentioned but she died so quickly. Also found heart murmur.

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on November 10th, 2018

Thank you for contacting Pet Coach with your question about Mittens. First off, I am very sorry you lost her so suddenly, please accept my condolences for your loss. Without seeing her in person, I can't say what happened but I can only give my best guess. If her red blood cells were so low, it could be she had non-regenerative anemia. When anemia is non-regenerative, the bone marrow response is inadequate when compared to the increased need. Cats who become anemic quickly can die from the sudden loss in red blood cells and oxygen. That could be why she passed away so quickly. Non-regenerative anemia can be caused by things like an infection such as FIV or feline leukemia, exposure to toxins, and lead poisoning. The vet who treated her may have a better idea as to what caused her to die so suddenly, and I would speak with that vet so you can hopefully get some more answers. I hope this helps somewhat, and again I'm sorry for your loss.

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