CONDITION

Exocrine Pancreatic Insufficiency (EPI)

Exocrine pancreatic insufficiency occurs when the pancreas fails to produce adequate digestive enzymes, resulting in malabsorption and characteristic signs of weight loss despite a voracious appetite.

Why this matters now

EPI commonly appears in young adult dogs, particularly German Shepherd Dogs, though it can develop at any age in any breed. The condition often progresses gradually, with owners initially puzzled by weight loss despite adequate or increased food intake.

As enzyme production declines, digestion becomes increasingly inefficient. Dogs may initially compensate by eating more, but weight loss eventually becomes apparent. Without treatment, severe malnutrition develops, affecting energy levels, coat quality, and overall health. Secondary vitamin deficiencies can cause additional complications.

Signals & patterns

Early signals

Increased appetite

Dogs with EPI often appear constantly hungry, seeking food obsessively because nutrients are not being absorbed.

Weight loss despite eating well

The hallmark of malabsorption disorders; food passes through without proper digestion.

Soft or loose stools

Poorly digested food results in abnormal faecal consistency.

Increased stool volume

Undigested material creates bulky, voluminous faeces often with a pale or greyish colour.

Later signals

Oily, foul-smelling faeces

Undigested fats produce characteristic greasy stools with a particularly offensive odour.

Coprophagia

Eating faeces may occur as dogs attempt to recover undigested nutrients.

Poor coat condition

Fat-soluble vitamin deficiencies and protein malnutrition affect skin and fur quality.

Flatulence

Bacterial fermentation of undigested food produces excessive gas.

Click to read about the biological mechanisms

How this is usually investigated

Diagnosis relies primarily on measuring pancreatic enzyme levels in blood, combined with assessment of nutritional status and identification of secondary complications.

Serum TLI (trypsin-like immunoreactivity)

Purpose: Measures pancreatic enzyme levels to confirm inadequate production
Considerations: Requires fasting sample; values below 2.5 μg/L are diagnostic; the most reliable test for EPI.

Serum cobalamin (vitamin B12)

Purpose: Assesses for secondary deficiency due to malabsorption
Considerations: Often low in EPI patients; supplementation may be needed alongside enzyme replacement.

Serum folate

Purpose: Can indicate small intestinal bacterial overgrowth when elevated
Considerations: Bacteria produce folate; high levels suggest concurrent intestinal imbalance.

Faecal examination

Purpose: Rules out parasites and assesses fat content
Considerations: Steatorrhoea (excess fat) supports malabsorption diagnosis.

Abdominal ultrasound

Purpose: Visualises pancreatic structure and rules out other conditions
Considerations: May show pancreatic atrophy; helps exclude concurrent disease.

Options & trade-offs

Management centres on replacing the missing digestive enzymes, addressing secondary deficiencies, and dietary modification to support absorption.

Pancreatic enzyme replacement

Powdered enzymes mixed with each meal to enable digestion

Trade-offs: Essential and effective treatment; lifelong requirement; cost can be significant.

Cobalamin supplementation

Vitamin B12 injections or high-dose oral supplementation to correct deficiency

Trade-offs: Often necessary for full recovery; injections may require vet visits initially; can often transition to oral.

Dietary modification

Highly digestible, moderate-fat diets that complement enzyme therapy

Trade-offs: Supports treatment success; some dogs do well on various diets once enzymes are replaced.

Antibiotic therapy

Courses of antibiotics to address small intestinal bacterial overgrowth

Trade-offs: May be needed intermittently; helps resolve incomplete responses to enzymes alone.

Pre-incubation of enzymes

Mixing enzymes with food before feeding to enhance activation

Trade-offs: May improve digestion in some dogs; adds time to meal preparation; not always necessary.

Common misconceptions

Misconception:

"Dogs with EPI should eat very low-fat diets"

Reality:

While historically recommended, many dogs with EPI on adequate enzyme replacement can tolerate moderate fat levels, which provide valuable calories.

Misconception:

"EPI is cured once the dog gains weight"

Reality:

EPI requires lifelong enzyme supplementation with every meal; stopping treatment causes rapid return of symptoms.

Misconception:

"Only German Shepherds get EPI"

Reality:

While German Shepherds are predisposed, EPI can affect any breed and may result from chronic pancreatitis in older dogs.

Owners of dogs showing weight loss alongside increased appetite and digestive changes may find value in testing for EPI. Understanding that effective management exists can provide reassurance that affected dogs can regain condition and enjoy good quality of life with appropriate treatment.

Last reviewed: 24 April 2026 · Dr Alastair Greenway MRCVS