[header] How to treat a cat with bloody diarrhea [title] Take the cat to the vet. [step] Blood in your cat's stool may be due to a variety of conditions, so you need to take your cat to the vet as soon as possible. Bloody diarrhea can lead the cat to become dehydrated. 
Bloody diarrhea may be due to minor problems, like food intolerance, or serious conditions, like cancer. [substeps] The vet will complete a physical examination and take a complete medical history.