Canine EPI: Quick Clinical Handout for Vets

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What it is

Exocrine pancreatic insufficiency (EPI) is failure of the exocrine pancreas to produce enough digestive enzymes, causing maldigestion and malabsorption. In dogs, the most common causes are pancreatic acinar atrophy and chronic pancreatitis.

Classic presentation

• Weight loss despite normal or increased appetite

• Large-volume stools, often loose, pale, greasy, or cow-pie-like

• Poor haircoat, flatulence, borborygmi, poor body condition

• Some dogs eat feces or act ravenous

• Many cases also have concurrent cobalamin (B12) deficiency

High-yield diagnostic point

The best screening and confirmatory test is serum canine trypsin-like immunoreactivity (cTLI).

Fecal enzyme tests are not the preferred definitive test.

Important labs to add

• Serum cobalamin (B12): should be checked because deficiency is common and affects management and prognosis

• Folate: may help assess concurrent dysbiosis or small-intestinal changes, though it is secondary to cTLI and cobalamin

Main treatment

1. Pancreatic enzyme replacement with every meal Powdered pancreatic enzymes are standard first-line therapy.

2. Cobalamin (B12) supplementation if low, low-normal, or clinically suspected B12 deficiency is common in canine EPI and should be corrected. Typical parenteral B12 schedule:

   • weekly injections for 6 weeks

   • then 1 injection one month later

   • then recheck B12 about 1 month after the last injection

3. If the level is only normal rather than high-normal/supranormal, or if symptoms recur, many dogs need ongoing maintenance B12, often monthly and sometimes weekly or every other week, depending on response and repeat labwork.

4. Diet No single diet works for every dog; many improve on a highly digestible diet. Fat restriction is not always required unless there is another reason.

5. Tylan (tylosin) powder may be considered if diarrhea persists despite enzymes and B12 This is usually considered when there is suspected secondary dysbiosis / antibiotic-responsive diarrhea rather than as the first treatment step. Common veterinary dosing reference:

   • tylosin 25 mg/kg by mouth every 12 hours for 6-8 weeks

6. Because tylosin can alter the gut microbiome and is not needed in every EPI dog, it should be used under veterinary direction.

7. Consider other antibiotics only if clinically needed Enzyme therapy plus cobalamin correction remain the foundation.

8. Consider Probiotic such as FortiFlora Pro Synbiotic Action powder

Practical treatment notes

• Enzymes need to be given with every meal, lifelong in most cases, dose adjustment may be necessary at first

• Always pre-moisten food

• Dogs often improve markedly once enzyme replacement and B12 support are correct, though some require dose tuning and time

• If the dog still has loose stool, weight loss, or poor response despite enzymes, ask about serum cobalamin testing and whether Tylan powder is appropriate

• B12 should ideally be guided by repeat labwork, because some dogs need long-term maintenance supplementation

Prognosis

Most dogs can do well long-term with correct enzyme replacement and correction of cobalamin deficiency.

One-sentence exam-room version

This dog may have EPI, a pancreatic enzyme deficiency causing maldigestion; the key test is cTLI, and standard treatment is pancreatic enzymes with every meal plus checking and treating B12 deficiency, with Tylan powder considered if diarrhea persists despite initial therapy, and a good quality probiotic.

Good references to hand a vet

• Merck Veterinary Manual: Exocrine Pancreatic Insufficiency in Dogs and Cats

• Veterinary Partner (VIN): owner-friendly but accurate overview

• Texas A&M GI Lab information on cobalamin and tylosin use in canine GI disease