What killed my kitten suddenly in 3 days? Could it be poison?

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.

There are three very common diseases that cats get that can cause his symptoms: diabetes, kidney failure and hyperthyroidism. If left untreated, all can cause death. I doubt a virus has much to do with it but of course it is possible. As for the vitamins, if they were made for cats that is not likely the cause. If it was not cat vitamins then it is possible he was overdosed. Not all vitamins are safe in large doses. I am sorry this happened and that he passed. In the future please get your cat examined by a veterinarian before the disease has progressed to this point. When they start losing weight that should be a good indicator that something is wrong especially if they are not eating and lethargic as well. Best wishes.

Sorry to hear this! Unfortunately, this is not an uncommon situation with small kittens. They usually die suddenly like this due to a heritable defect, poor immunity, or a severe disease like panleukopenia. There are very few diseases that a kitten can pass onto people and considering that she died so quickly, I would not be concerned about any diseases that could be passed to people. Most of the diseases carried by cats that can be passed to people are not a problem for healthy people and would not be nearly as deadly. If you did get a disease like toxoplasmosis or bartenolosis there would be warning signs such as feeling malaise, or Flu-like. Again, it's extremely unlikely for this to happen to you, but if you did feel sick in the next two weeks, then it would be good to mention the kitten to your doctor. Either way, the diseases that you could get from cats can be treated and would not be deadly (besides rabies, which is extremely unlikely in this case). I really wouldn't worry though. I've seen many of these little kittens die suddenly in shelters and have never had a concern about a zoonotic disease (disease passed from animals to people). I hope that helps.

He may have had an injury, been hit by a car or he had a congenital heart defect that caused a blood clot at the bifurcation of the aorta (that paralyses hind legs and hurts terribly). This can also cause a clot in the lungs which would cause breathing problems. Unfortunately most cats with these blood clots die within a short time. I am so sorry for your loss. This is very sad.

I am so very sorry that you lost your cats. Please accept my condolences for your loss. Without seeing them in person, I can't say what caused them to die, but it may have been something contagious. It could have been something like feline Panleukopenia, it's highly contagious. The other option is they all got into something toxic. Again, I'm sorry for your loss.

Poor baby! I am so sorry for your loss. My biggest concern with cats and sudden deaths like this would be congenital heart problems especially i male cats. It can cause them to throw clots which could have caused paralysis in the other rear leg. It can also cause a high blood pressure which could cause acute blindness. Another concern would be some type of toxin. You could always have a necropsy done on him to see if they can find the cause but sometimes the results are inconclusive. Again, I am sorry for your loss. I hope this helps.

Unfortunately, sometimes kitties can be born with a congenital heart defect, which then causes sudden death. A vet will not always be able to hear this heart defect on auscultation. She could have also had a type of stroke, and attacked your son because she all of a sudden felt sick. There are also infectious diseases that can cause bleeding and diarrhea, especially when they occur in the peracute form. I think you should make sure your other animals are up to date on vaccines, and if there is the slightest suspicion that the other cat or the dog are "off", you should take them to a vet right away.