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Dietary management of enteropathies in dogs: Effective nutrition and treatment of chronic intestinal disorders

  • Ecommercy
  • 2026-09-22
  • 16:22
  • 0 comments

Gastrointestinal diseases are among the most common reasons dogs are presented to a vet. Sometimes these are isolated episodes occurring once or twice a year, while in other cases owners report that their dog has a “sensitive stomach” and ongoing digestive problems. Many owners return repeatedly to the veterinary practice because of various problems related to digestion and defecation. In such cases, it is worth considering whether the dog may actually be affected by chronic enteropathy.

Modern veterinary gastroenterology focuses primarily on the role of the gut microbiome and diet as key factors in the prevention and treatment of gastrointestinal disease. We also know that up to 70% of patients may achieve long-term improvement through dietary modification alone, making nutritional management an essential part of treatment.

What are enteropathies?

Over recent years, veterinary gastroenterology has significantly changed its approach to diagnosing and treating chronic gastrointestinal diseases in dogs and cats. Understanding the general classification of enteropathies makes it easier to understand both the diagnostic approach and treatment strategies.

Enteropathy is a broad term referring to inflammatory intestinal disease involving changes in the gastrointestinal mucosa, which can result in impaired absorption, digestibility and intestinal function. Enteropathies can be classified in several ways depending on the criteria used, including disease duration, histopathological findings and response to treatment.

Acute and chronic intestinal disorders are generally distinguished using a three-week threshold. Diarrhoea lasting up to seven days is considered acute, while diarrhoea lasting longer than seven days is considered persistent. Chronic enteropathies last for more than three weeks and may continue for years.

Acute diarrhoea is most commonly associated with dietary indiscretion, bacterial, viral or parasitic infections such as giardiasis, poisoning and other concurrent diseases.

Chronic enteropathies may cause continuous signs of varying severity or recurrent episodes. For example, a dog may have loose stools every few days alternating with well-formed stools, together with episodes of mucus in the faeces, abdominal gurgling and flatulence. This may not resemble typical diarrhoea, but it nevertheless indicates that the gastrointestinal tract is not functioning as it should.

Clinical signs may be similar in both acute and chronic gastrointestinal disorders. Diarrhoea is the most common sign, with stools that are more watery than usual, often produced in larger quantities or more frequently, with changes in colour and sometimes containing mucus or fresh blood.

Although detailed descriptions of faeces may seem excessive to some owners, they provide vets with valuable information – including photographic documentation. The Bristol Stool Scale, together with information about defecation frequency, can be a useful tool for assessing stool appearance. Such detailed descriptions may help determine whether diarrhoea originates from the small or large intestine.

Other common signs include vomiting, including morning or so-called hunger vomiting, as well as regurgitation, lip licking, belching, abdominal gurgling, louder and more frequent or foul-smelling flatulence, and decreased or increased appetite.

In patients with chronic problems, changes in the coat may also occur, including excessive hair loss and reduced coat shine or density. Severe and prolonged disease may also lead to weight loss and loss of muscle mass.

Signs of chronic enteropathy may also include reflux, which in some dogs can present as coughing rather than only lip licking, regurgitation, grass eating or vomiting on an empty stomach.

Acute diarrhoea occurs most commonly in young or older animals and may be accompanied by lethargy and deterioration in general well-being.

It is most often caused by dietary indiscretion, including spoiled food, rubbish, sudden dietary changes, table scraps and ingestion of items that dogs should not eat, such as toys, paper or plastic.

Acute gastrointestinal problems in puppies are frequently associated with viral infections and certain parasites, including Giardia. Acute haemorrhagic diarrhoea syndrome (AHDS) is another form of acute diarrhoea. Despite its alarming name and often dramatic clinical presentation, most cases respond well to standard treatment.

Classification of chronic enteropathies

Chronic enteropathies (CE) are most conveniently classified according to their response to treatment. Several main types are recognised in dogs:

FRE – food-responsive enteropathy

This accounts for as many as 50–70% of dogs with chronic intestinal problems and resolves following a change to a diet that is appropriate for the individual patient. Because dogs vary considerably in their tolerance of different diets, dietary trials should include several different types of food when necessary.

MRE – microbiota-related modulation-responsive enteropathy

Previously referred to as SIBO and later as ARE (antibiotic-responsive enteropathy), this category is currently receiving considerable attention across several veterinary disciplines.

It involves quantitative and qualitative disturbances of the gut microbiome – the enormous population of microorganisms living in the intestines and contributing to digestion and physiological homeostasis. The number of bacteria present in the gastrointestinal tract is estimated to be in the trillions.

This type of enteropathy responds to modulation and support of the gut microbiome through diet, probiotics, prebiotics and faecal microbiota transplantation.

IRE – immunosuppressant-responsive enteropathy

This occurs in dogs whose clinical signs result from an abnormal immune response and who require temporary or long-term immunosuppressive treatment for stabilisation when previous approaches – including diet and supportive supplementation – have been unsuccessful.

NRE – non-responsive enteropathy

This is the most challenging form and requires more extensive diagnostic investigation. In severe cases, it may fail to respond to any form of treatment.

A separate subgroup is protein-losing enteropathy (PLE), in which protein is lost through the gastrointestinal tract as a result of impaired absorption, immune-mediated processes, impaired dietary fat tolerance or individual predisposition.

PLE requires particularly careful nutritional management and may have a severe clinical course.

How are chronic enteropathies diagnosed?

In simplified terms, a detailed medical history is the foundation of diagnosing chronic intestinal disorders. During the consultation, the vet may ask very detailed questions about the clinical signs, their frequency and type, stool quality and responses to previous treatment, including the types of supplements used.

In addition to reviewing the patient’s medical history and previous diagnostic tests, a detailed nutritional history is essential. This should include what the patient has previously eaten, how they responded to different diets, which protein sources were used and for how long, as well as any additional foods, treats or chews.

Responses to travel and stress may also be relevant, as these factors frequently exacerbate gastrointestinal signs.

The clinical examination includes an assessment of the patient’s general condition, body condition score (BCS) and muscle condition score (MCS). This allows changes in body weight and muscle mass to be monitored objectively.

Laboratory investigations may include a complete blood count, serum biochemistry, pancreatic tests and a pancreatic-gastrointestinal profile, faecal examination for parasites and, where appropriate, additional testing to exclude diseases that may affect the gastrointestinal tract, such as hypoadrenocorticism.

Ultrasonography is the primary diagnostic imaging technique, with radiography used when indicated. In many cases, diagnostic tests reveal no significant abnormalities or only minimal changes, which should always prompt careful consideration of dietary factors.

Dietary management – the cornerstone of enteropathy treatment

Diet is now considered the most important and effective therapeutic tool for most dogs with chronic intestinal disorders. Studies estimate that up to 70% of dogs may respond to dietary management alone.

When patients previously classified as having NRE – non-responsive enteropathy – have been reassessed, subsequent dietary changes have successfully stabilised as many as 60% of them. This further demonstrates that dietary trials can be time-consuming and may need to be repeated several times, but can ultimately lead to successful management.

Diet should help reduce the immune response generated by gut-associated lymphoid tissue (GALT). GALT may overreact to unsuitable dietary components and exacerbate intestinal inflammation and clinical signs. An appropriately selected diet should reduce GALT activation and help control inflammation.

Reducing inflammation within the intestinal mucosa improves nutrient absorption and utilisation, which can contribute to better nutritional status, preservation of muscle mass, improved satiety and reduced faecal volume.

A highly digestible diet with appropriate amounts and types of dietary fibre and prebiotics is recommended to stabilise intestinal disorders. High nutrient digestibility reduces bacterial fermentation in the intestine – fewer undigested food residues mean less fermentation, abdominal gurgling and flatulence – while prebiotics support and nourish the gut microbiome.

Together, these factors can reduce faecal volume, improve stool consistency and support regeneration of the colonic mucosa, helping to reduce mucus production and fluctuations in stool quality.

Improved digestibility also reduces the retention of food contents in the upper gastrointestinal tract, which may help reduce reflux signs.

Diet alone may completely resolve the clinical signs of enteropathy or, when combined with medical treatment, allow medication to be reduced. Conversely, medication cannot replace an appropriate diet. In most cases, the dog’s condition stabilises only after effective nutritional management has been introduced.

Which diets are used in enteropathies?

Response to dietary treatment is most commonly achieved by changing the type of diet – for example, switching from dry to wet or home-cooked food, changing previously used protein sources and additional ingredients, or modifying the digestibility of the diet.

Fat content also plays a particularly important role, especially in patients with protein-losing enteropathy.

According to various sources, highly digestible diets should provide:

  • protein digestibility above 85–87%,
  • fat and carbohydrate digestibility above 90%,
  • dietary fibre below 5% of dry matter.

In addition to digestibility requirements, several dietary approaches can be considered:

1. Novel-protein diets

These are particularly useful when food allergy is also suspected. They should be based on a protein source and additional ingredients that the patient has not previously consumed.

Both commercial and home-prepared diets may be used. When assessing a possible food allergy, the diet should be followed for at least 4–6 weeks.

2. Hydrolysed diets

Food components in hydrolysed diets are enzymatically broken down into particles small enough that the immune system is less likely to recognise them as allergens.

However, up to 30% of patients may still react to hydrolysed proteins in the context of food allergy. In gastroenterology, these diets are also used because they tend to have somewhat higher digestibility than standard foods, facilitating nutrient absorption.

3. Highly digestible, low-fat diets

These diets are used in patients with gastritis, reflux, pancreatic disease and small intestinal disorders.

A low-fat diet should contain approximately 25 g, and ideally around 20 g, of fat per 1,000 kcal. Some patients require an ultra-low-fat (ULF) diet containing less than 5–10 g of fat per 1,000 kcal.

Commercial highly digestible diets are most commonly marketed as “gastrointestinal” diets, although their actual fat content should always be checked.

4. Home-cooked diets

Home-cooked diets can be an excellent option for patients with chronic enteropathy because they allow precise ingredient selection, close quality control, high palatability and adjustment of individual nutritional parameters – sometimes more precisely than commercial diets, particularly when an ULF diet is required.

Studies indicate that home-prepared diets can be particularly effective in dogs with chronic enteropathies when they are properly balanced by an animal nutritionist.

How long should a dietary trial last?

A new diet should be introduced gradually in patients with severe as well as moderate or mild gastrointestinal problems. A transition period of approximately 5–7 days is usually recommended.

Once the transition is complete, the response to the new diet should be assessed over the following 7–21 days.

If there is a marked deterioration within 7–10 days of introducing the diet, the patient should return to the previous diet or switch to another option. If the diet is relatively well tolerated, a clear improvement in clinical signs should usually be evident within three weeks.

If there is no improvement, different types of diets should be trialled, including monoprotein novel-protein diets, hydrolysed diets, low-fat gastrointestinal diets and several variations of home-prepared diets.

These patients should not receive additional treats or chews unless agreed with the vet and animal nutritionist. Even a small additional food item can compromise the diagnostic process, so honesty and communication are essential. If rewarding the dog is important to the owner, alternative solutions can be found without introducing unapproved foods.

In this context, diet should be treated like medication – just as additional medicines would not be introduced without consultation during treatment, additional foods should not be given without discussion.

Trials of different forms of prebiotic and probiotic therapy may be conducted at the same time. Here too, the appropriate product may need to be selected individually for each patient.

As this demonstrates, finding the right diet can be a long and demanding process. However, the numbers speak for themselves – as many as 7 out of 10 patients may achieve control of their clinical signs with an appropriately selected diet.

Summary – why should diet be the first and most important component of treatment?

A properly conducted dietary trial is one of the most important and effective therapeutic tools in canine gastroenterology. Current evidence demonstrates a significant response to dietary intervention compared with other forms of treatment and supplementation.

For more than half of patients, dietary management may be the only intervention required to achieve stabilisation. Even in many patients who have previously failed to respond to treatment protocols, repeating dietary trials may result in improvement.

An inappropriate diet may itself contribute to gastrointestinal problems and to the development or exacerbation of chronic enteropathy.

Because dietary preferences and responses vary considerably between individuals, a minimum of five and potentially as many as ten dietary trials may be appropriate, involving different forms of food – commercial or home-prepared, dry or wet.

Home-prepared diets offer several advantages and can be highly effective when properly balanced. Additional supplements such as probiotics and prebiotics may also play an important supportive role.

References

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Aleksandra Szuba

Vet, graduated from the Faculty of Veterinary Medicine at Wrocław University of Environmental and Life Sciences in 2011. She treats a wide range of internal medicine patients, with a particular interest in gastroenterology, dermatology and endocrinology.

For several years, she has also provided nutritional consultations for patients through the Surowe Kotki i Psy Foundation and currently works with I-Vet Veterinary Practice in Katowice and Zwierzyniec in Kraków. She most frequently develops dietary plans for gastrointestinal and nephrology patients and animals with allergies.

As part of her educational work, she delivers training courses in canine and feline nutrition, including two training series covering the fundamentals of dog and cat nutrition for Wydawnictwo Forum, as well as numerous webinars and training sessions organised through the Foundation.

She has contributed to Agnieszka Cholewiak-Góralczyk’s books Psie Smaki, Kocie Smaki and Mam chorego zwierzaka, and more recently has become an author of nutrition articles for VetCase.

She is a member of the ESVCN and ESCG and is currently completing the ESAVS Clinical Nutrition programme.