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IBD in Dogs

What Is IBD in Dogs?

Inflammatory bowel disease (IBD) in dogs isn’t a standalone ailment but rather a syndrome triggered by persistent irritation of the intestinal tract. It arises from various factors, typically manifesting as a cluster of symptoms resulting from one disease or a combination thereof.

Regardless of the root cause, the outcome is inflammation within the gastrointestinal (GI) tract. Often accompanied by an impaired immune system, this inflammation sets off heightened allergic reactions, leading to further inflammation, discomfort, and thickening of the GI tract. With time, this hampers the proper digestion and absorption of nutrients. It’s crucial not to overlook IBD as it significantly affects the well-being of your dog.

IBD can impact any part of the GI tract, spanning from the stomach to the small and large intestines, or any combination thereof. It’s important to note that IBD differs from irritable bowel syndrome (IBS), which affects the intestinal muscles, particularly those of the large intestine, causing constipation and diarrhea in dogs. Fortunately, IBS is exceedingly rare in dogs.


The symptoms of inflammatory bowel disease (IBD) in dogs typically manifest in relation to the gastrointestinal (GI) tract and may have occurred sporadically over several weeks:

  • Vomiting
  • Diarrhea
  • Loss of appetite
  • Excessive gas
  • Melena (dark, tarry stools)

Failure to address these symptoms can result in inadequate nutrient absorption, leading to weight loss, abdominal distension, swelling of the limbs, and, in severe cases, fatal blood clots.


As a syndrome, inflammatory bowel disease (IBD) in dogs typically arises from various causes, although the exact underlying cause often remains unknown. Conditions frequently associated with IBD, all of which result in GI tract inflammation and trigger immune responses, include:

  • Parasitic infections, often observed with Giardia
  • Bacterial infections and other infectious agents
  • Dysbiosis, characterized by the imbalance of normal bacterial populations within the GI tract
  • Food allergies or sensitivities
  • Overactive or exaggerated immune responses, often referred to as “autoimmune” conditions

Furthermore, genetic factors may also play a role, as certain breeds such as Yorkshire Terriers, German Shepherds, and Boxers are predisposed to developing the condition.


While a physical examination by your veterinarian may suggest inflammatory bowel disease (IBD) as a potential diagnosis, it alone is not sufficient for a conclusive diagnosis. Laboratory tests such as bloodwork, urinalysis, and imaging studies like x-rays and ultrasound may be advised. Although these test results may indicate the presence of IBD, definitive diagnosis typically requires biopsies of the intestinal tract.

Biopsy is considered the gold standard and can be conducted through procedures such as endoscopy, colonoscopy, or exploratory surgery. However, due to the invasive nature and potential cost barriers, IBD is often presumed rather than confirmed through biopsy.

Supportive findings from the aforementioned tests may include:

  • Anemia, often indicative of chronic blood loss or inflammation
  • Reduced levels of proteins such as albumin and cholesterol
  • Elevated liver enzymes (ALT, ALP)
  • Distended intestinal segments with gas and fluid
  • Thickening of intestinal walls

Additional tests that your veterinarian might recommend include stool examinations to check for parasitic infections, blood tests to assess nutrient absorption capability, and an ACTH stimulation test to rule out Addison’s disease (adrenal insufficiency).


Regrettably, there is no cure for inflammatory bowel disease (IBD) in dogs; however, it can be effectively managed and controlled. Adherence to your veterinarian’s instructions during treatment is crucial, as it often involves a combination of medications to ensure your dog’s well-being.

Anti-inflammatories and immunosuppressants are fundamental to treatment, with prednisone, budesonide, and azathioprine being commonly prescribed. These medications come with associated risks, so it’s essential to discuss potential side effects with your veterinarian and avoid discontinuing their use without professional guidance.

Furthermore, considering the significance of food sensitivity in IBD, your veterinarian will likely recommend dietary changes. This may involve transitioning to a novel protein diet, incorporating less commonly used protein sources like fish, duck, rabbit, venison, or kangaroo. Alternatively, a hydrolyzed diet may be suggested, where proteins are broken down into small fragments to reduce the likelihood of an immune system reaction. In some cases, dietary modifications alone may prove effective as a sole therapy.

Given the limitations of stool examinations, deworming and an antibiotic trial may also be advised. Recent research has indicated the benefits of probiotics and prebiotics in restoring and maintaining gastrointestinal health, aiding in the growth of beneficial bacteria.

What If a Dog with IBD Isn't Getting Better?

Even with the appropriate combination and dosage of medications, it’s not unusual for the treatment of inflammatory bowel disease (IBD) in dogs to require time. Patience is important; improvement in your dog’s symptoms often takes several weeks. However, maintaining communication with your veterinarian and following their guidance, including scheduling re-checks and lab tests, is essential for monitoring your dog’s response to treatment.

Living and Management

Inflammatory bowel disease (IBD) in dogs is a lifelong condition without a cure. It’s important not to discontinue treatment without consulting your veterinarian first. Typically, the initially prescribed medications will be gradually tapered over several weeks to months, ensuring the use of the lowest effective dose to manage symptoms and minimize reactions. The prognosis for your dog depends on the severity of the syndrome, with pets having low protein levels having a lower chance of long-term recovery.

Due to the impact on the immune system, caution is advised with any medications or injections, such as vaccines, that could potentially stimulate it. Before administering any treatments, discuss the associated risks and benefits with your veterinarian.

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