Cat Hairball Vomit Blood. Why does brown vomit suggest blood? Turns out he had eaten some mouse poison.
That means it might be caused by external bleeding that the cat licked, or bleeding in the mouth. A hairball can be abrasive, so some blood in a cat's vomit could be a result of a hairball scratching the cat's stomach or esophagus. A list of some of the causes of vomiting in cats.
Don’t let your cat eat her expelled vomit, even if she tries.
She took her cat to the vet and he told her that everything is ok. She's had a normal bowel movement, and i've seen her eating. If your cat continues to vomit, ask your vet if an ultrasound or endoscopy would be beneficial to determine the cause of the problem. In most instances, after eating grass if you are keen, you will notice blood in your cat’s pukes.