Dog Bloody Stool and Vomiting: Causes and Solutions

1 Common Causes

Overeating. Dogs are greedy and will sniff and eat anything if unsupervised, and owners often give in to begging, so the dog eats too much. Vigorous exercise right after a full meal also triggers vomiting. If daily diet and care are ignored, a dog may suddenly vomit, and in severe cases both sudden vomiting and bloody stool appear together.

Gastroenteritis. Dog gastroenteritis comes in acute and chronic forms. Acute enteritis features abdominal pain, diarrhea, fever, and toxemia; chronic enteritis brings repeated vomiting and loose, foul-smelling stools, and bloody stool in severe cases. Either way, get a veterinary diagnosis, then control the diet to ease the digestive burden. Use probiotics to regulate the gut until full recovery.

Distemper and parvovirus. Canine parvovirus has two forms: myocardial and enteric. The myocardial form mostly affects puppies, with pale mucous membranes and breathing difficulty; the enteric form centers on vomiting and diarrhea. Stools start yellow or grayish-white with much mucus, then become watery and blood-tinged, along with clear rhinitis and conjunctivitis—nasal discharge, sneezing, coughing, dry cracked nose.

Parasites. If the dog has not been dewormed for a long time, parasites may cause it to vomit and pass blood. Check the last deworming date and look for worms in the stool; if present, a routine internal deworming resolves it.

2 What to Do

Because these causes range from mild to life-threatening, have a vet confirm the cause rather than guessing. Withhold food, keep the dog hydrated, and support the gut with probiotics; follow the vet’s specific treatment for viral or parasitic disease.