My 11 year old Black Lab has had two bouts of bloody diarrhea in the last six months. The first bout was not as bad as the most recent, and cleared up in a couple days with antibiotics and a bland diet.
This last bout was more serious, requiring two days of IV fluids, antibiotic shots, and shots to relieve her vomiting, as she could not even hold down water.
The vet did a blood panel, which came back normal. No other tests were done. She is home now, still a little lethargic, but is eating well, holding it down, and so far, no diarrhea.
But…we still don’t have any answers. I am concerned about why this is happening to her, and feel the need to know the cause. I feel more tests are necessary, and am planning to get a second opinion.
I would appreciate any advice as to what to look for, or what tests to ask for.
Thanks so much!

Bloody diarrhea can be caused by eating grass, whipworms, medications, and allergic reactions. Make sure a stool sample floatation is used to check for whipworms and hookworms. A bland diet is good, such as 4 parts rice to 1 part hamburger, mixed and then boiled with water poured off. Temporary during the problem….not permanent. Also, often intestinal problems do not show up as abnormalities in blood work. If it continues…ultrasound and radiographs would be helpful.
Larry Baker, DVM
The Northgate Pet Clinic
Decatur, IL
This problem could be due to parasites (some of which are difficult to find with just one fecal test) and food allergies. A bland diet does not necessarily improve the situation unless it has the proper ingredients that the dog or cat is not allergic to.
Ihor Basko, DVM
All Creatures Great & Small
Kapaa, HI
A second opinion is in order.
BUT FIRST, EXTREMELY IMPORTANT: deworm
Then abdominal radiographs, ultrasound, digital rectal exam.
Phillip McHugh, DVM
Park Veterinary Hospital
Durham, NC