Managing Acute Ulcerative Colitis in a Geriatric Labrador: A Practical Clinical Approach

Colitis is characterized by inflammation of the large intestine and remains a frequently encountered gastrointestinal condition in small animal practice. Dogs with colitis commonly present with frequent loose stools containing mucus, fresh blood, or both, often accompanied by tenesmus and abdominal discomfort. Unlike small intestinal diarrhea, large bowel diarrhea is typically associated with normal appetite and minimal weight loss, making careful clinical differentiation essential¹. As described by Ishii et al, inflammation of the colon disrupts water and electrolyte absorption while inflammatory cytokines trigger giant migrating contractions, resulting in the sudden and urgent need to defecate². 

The following case highlights the symptomatic diagnosis and successful medical management of ulcerative colitis in an elderly Labrador Retriever. 

Acute Presentation in a Senior Dog¹ 

A ten-year-old intact male Labrador dog was presented to the Veterinary Clinical Complex, Nagpur, with a two-day history of frequent loose motions containing frank blood and mucus. The onset was sudden and associated with a single episode of vomiting. The owner also reported inappetence, although water intake and urine output remained normal. Importantly, there was no history of dietary change, and the dog had a consistent vaccination and deworming schedule. 

On physical examination, the patient appeared mildly dull and lethargic with approximately 3–5% dehydration, evident from sticky mucous membranes. Conjunctival mucous membranes were slightly pale, suggesting mild anemia, while the heart rate was elevated at 132 beats per minute. Rectal temperature, capillary refill time, and lymph nodes were within normal limits. 

Given the acute hemorrhagic diarrhea, clinicians appropriately prioritized ruling out infectious and parasitic causes. Snap testing was negative for canine coronavirus and parvovirus infection, fecal examination revealed no helminth ova, and peripheral blood smear examination excluded hemoprotozoan infections. The absence of dietary indiscretion, parasitic burden, and gastrointestinal obstruction further narrowed the differential diagnosis. 

Based on the constellation of clinical signs, the case was tentatively diagnosed as ulcerative colitis. 

Understanding the Pathophysiology 

Ulcerative colitis is a form of inflammatory bowel disease characterized by mucosal inflammation and epithelial disruption within the colon. According to Feuerstein et al. and Nolte et al., inflammatory cell infiltration, particularly involving macrophages, contributes to mucosal ulceration, excessive mucus production, and hematochezia. Inflammation also impairs electrolyte absorption and stimulates cytokine release, leading to sudden and frequent episodes of diarrhea^3,4. 

Escherichia coli has been implicated as one of the important bacterial contributors to colonic inflammation¹. This explains why antimicrobial therapy remains an important component of management in selected acute colitis cases. 

Practical Medical Management¹ 

The patient was managed aggressively with both supportive and anti-inflammatory therapy. Intravenous Ringer’s Lactate was administered at 10 ml/kg BID to correct dehydration and electrolyte imbalance. Antimicrobial coverage included injectable metronidazole and enrofloxacin, targeting anaerobic and gram-negative enteric pathogens respectively. 

Prednisolone was included to suppress excessive immune-mediated inflammation and reduce mucosal injury, consistent with observations by Rak et al. (2023)⁵. Ondansetron was administered to control vomiting and improve patient comfort. 

Gastrointestinal mucosal protection formed another key aspect of therapy. Sucralfate suspension and rabeprazole were used to minimize acid-related mucosal irritation and promote ulcer healing. Additionally, oral supplementation with hydrated calcium aluminosilicate clay (Haltorin) was introduced to support bowel regulation and stabilize gut health. 

Clinical Response and Key Takeaways¹ 

The patient showed progressive clinical improvement following initiation of therapy. Appetite gradually returned, hydration status normalized, and the frequency of defecation reduced significantly. Most importantly, stools became free from blood and mucus, indicating successful control of colonic inflammation. 

This case demonstrates the importance of a systematic clinical approach in dogs presenting with acute hemorrhagic large bowel diarrhea. While advanced diagnostics may not always be immediately feasible, careful exclusion of infectious, parasitic, dietary, and obstructive causes can help clinicians arrive at a strong tentative diagnosis. 

For practicing veterinarians, the case reinforces several practical considerations: 

• Acute ulcerative colitis can mimic infectious enteropathies and requires careful differential diagnosis.  

• Combined antimicrobial and anti-inflammatory therapy may provide rapid clinical improvement in acute inflammatory colitis.  

• Gastroprotectants and mucosal healing agents can significantly aid recovery.  

• Early fluid therapy remains essential to prevent dehydration and electrolyte imbalance in acute diarrheic patients.  

Although this was a single clinical case, the favorable response highlights how timely symptomatic management can successfully stabilize and resolve acute ulcerative colitis in dogs. 

References 

1. Sharma MR, Bhojne GR, Dhoot VM, Panchbhai CG, Gupta JS. ULCERATIVE COLITIS IN A DOG. INDIAN JOURNAL OF CANINE PRACTICE Учредители: Indian Society of Advancement of Canine Practice. 2024;16(2):133-5. http://www.indianjournalofcaninepractice.com/decem_2024/JOURNAL%20-%20DECEMBER%20-%202024-27-29.pdf 

2. Ishii PE, Suchodolski JS, Duarte R, Pereira AR, Lidbury JA, Steiner JM, Giaretta PR. Detection of invasive Escherichia coli in dogs with granulomatous colitis using immunohistochemistry. Journal of Veterinary Diagnostic Investigation. 2022 Nov;34(6):990-4. https://journals.sagepub.com/doi/pdf/10.1177/10406387221119712 

3. Feuerstein JD, Cheifetz AS. Ulcerative colitis: epidemiology, diagnosis, and management. InMayo Clinic Proceedings 2014 Nov 1 (Vol. 89, No. 11, pp. 1553-1563). Elsevier. https://www.mayoclinicproceedings.org/article/S0025-6196(14)00626-0/pdf 

4. Nolte A, Junginger J, Baum B, Hewicker-Trautwein M. Heterogeneity of macrophages in canine histiocytic ulcerative colitis. Innate immunity. 2017 Apr;23(3):228-39. https://journals.sagepub.com/doi/pdf/10.1177/1753425916686170 
5. Rak MB, Moyers TD, Price JM, Whittemore JC. Clinicopathologic and gastrointestinal effects of administration of prednisone, prednisone with omeprazole, or prednisone with probiotics to dogs: a double-blind randomized trial. Journal of veterinary internal medicine. 2023 Mar;37(2):465-75. https://academic.oup.com/jvim/article-pdf/37/2/465/66658079/jvim16672.pdf