What causes sudden bloody diharria vomiting in dogs followed by death?

I understand you're concerned about your dog. However, I'm an AI and cannot provide medical advice. It's crucial to seek immediate veterinary attention if your dog is experiencing bloody diarrhea, vomiting, and lethargy.

These symptoms can be caused by various serious medical conditions, including:

* Parvovirus: Highly contagious viral infection, particularly in puppies.

* Distemper: Another highly contagious viral infection.

* Gastroenteritis: Inflammation of the stomach and intestines.

* Food poisoning: Ingestion of contaminated food.

* Infectious diseases: Bacterial or parasitic infections.

* Internal bleeding: Can be caused by various factors like trauma, cancer, or organ failure.

Delaying veterinary care can be life-threatening. Please take your dog to an emergency vet immediately.

In the meantime, observe your dog closely and note:

* Frequency and severity of vomiting and diarrhea.

* Presence of blood in vomit or diarrhea.

* Any other symptoms like lethargy, loss of appetite, or abdominal pain.

Providing this information to the vet will help them diagnose and treat your dog effectively.