My cat died suddenly with foam, nosebleeds. What poisoned them?

Oh no, I'm so sorry that both of your cats have died recently! You are correct that they could have gotten into something toxic causing their symptoms, but unfortunately without seeing them in person, I can't say what that toxin might be. You could take their bodies into a vet for a necropsy (an autopsy for cats) which may give you some answers. If it's too late to take them in because you've already buried them, then I recommend looking out for similar symptoms in any other cats you may have at home. Should you see those symptoms again, rush them into a vet immediately for treatment. Again, I'm so sorry for your loss :-(

I am so sorry your cat died recently, please accept my condolences for your loss. The massive wounds may have been the cause of his death. He could have had internal injures you weren't aware of it, and that could have lead to him vomiting food and then blood. Unfortunately, without seeing him in person, I can't say for certain what caused his death. I recommend having a necropsy (an autopsy for animals) done on him, which may give you some answers as to what caused his death. Again, I'm so sorry for your loss :-(

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.

I'm so sorry this happened. Unfortunately there is no way for us to tell you why she died by looking at some photos. If you want to know for sure you will need to have a vet do an autopsy. If this way a young cat the two most common reasons for sudden death are trauma (like hit by a car) or poison ingestion.

My condolences to your friend on the loss of his or her cat. Unfortunately, without a post mortem exam it can be very difficult to determine cause of death. If he as vaccinated against rabies, it was likely not a cause. The only way to find out would be to submit brain tissue for testing. This must be done according to strict Health Department guidelines. A more likely cause was trauma, toxicity or heart disease.

I am so sorry you lost Buffy! I think it’s unlikely that the heater was the cause of death - I would think you would see some kind of burn or hair loss externally if that was the case. Heart disease is one of the more common causes of sudden death in cats and can cause bloody fluid to quickly build up in the lungs and come out of the nose and mouth. Other possibilities would be kidney disease, blunt trauma or a clotting disorder. You could ask your vet about a necropsy (autopsy) which might reveal a cause of death.

I'm so sorry. The blood from the mouth is a symptom of what your kitten died from, not the cause. There is no way to know for sure without a post-mortem exam. It could have been trauma or an infectious disease causing bleeding in the lungs.