Diarrhea with blood indicates that your dog suffers from inflammation of the large bowel, known as colitis. Below are the most common causes for colitis in dogs this age. Please click on the links below for more information on these diseases. Should you seek a one on one consultation with a licensed veterinarian, please visit our Ask the Vet page where you can submit a question 7 days a week, 24 hours a day:
Intestinal parasites
Coronavirus
Inflammatory Bowel Disease