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My cat died suddenly. Is my other kitten sick, grieving, or poisoned?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | unspayed | 7 lbs

So we had two cats my boy who wasn't even two just passed away by my side on the couch for no reason he was just fine but when I got up to leave to work and give him a hug he was stiff, Our other kitten who is a girl is starting to act strange she won't eat and is sleeping a lot more, and never wants to leave my side I'm worried for her she isn't even a year please help, the first pic is of my boy the day he passed, second one is my girl they, don't have there shots

1 Answer

Most Helpful Answer

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Answered By C. Rathjens, DVM

Veterinarian

Published on November 10th, 2017

I am so very sorry for your loss. I can't image how surprising and upset that must have been for you. The best way to find out why you're little boy passed away would be an autopsy. Without an autopsy, my best guess would be heart disease. Cats get a heart disease called hypertrophic cardiomyopathy, where the heart muscle is abnormally thick and doesn't pump blood effectively. Often and tragically the first symptom of this disease is sudden death. Little One could be grieving the loss of her brother - this is quite common. The surviving pet's routines and life are suddenly different and their playmate is gone, so they experience true loss. Depending on how recently your boy passed away, I might be concerned about a toxin making them both sick. If you know about any potential toxin exposure or if there is mouse bait in or around your home, Little One needs to go to the emergency vet right away. I would be most concerned about a toxin if it was within the last 12-24 hours that your boy passed away. Beyond that, it's unlikely that it's effecting her so much slowly. All in all, if she's really acting strange, not eating, sleeping too much, having any vomiting or diarrhea, it would be best to take her to the emergency clinic for an exam. If you still have your little boy's body, doing the autopsy could ease your mind as well. Please accept my condolences during this difficult time.

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