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Pancreatitis in Dogs and Cats: Complete Clinical Guide

Overview

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PART 1 - CLINICAL SIGNS AND SYMPTOMS

Dogs

Cats

• Anorexia (most common)
• Lethargy/depression
• Dehydration
• Weight loss
• Hypothermia (more common than fever in cats)
• Vomiting (less frequent than in dogs)
• Icterus (jaundice)
• Abdominal pain (often occult)
• Palpable abdominal mass (rare)

Key difference: Cats rarely show the dramatic vomiting and "prayer posture" seen in dogs. Many cats with pancreatitis present with only lethargy and anorexia. Also, cats commonly have concurrent triaditis - pancreatitis + cholangitis + inflammatory bowel disease occurring together.

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PART 2 - DIAGNOSIS

Step 1: History and Physical Exam

• Diet history (high-fat meal trigger in dogs)
• Drug history: phenobarbital, potassium bromide, L-asparaginase, azathioprine can cause pancreatitis
• Assess dehydration, pain score (modified Glasgow scale), body condition

Step 2: Bloodwork

• CBC: Leukocytosis (neutrophilia), possible anemia
• Biochemistry: Elevated ALT/AST, hyperbilirubinemia, azotemia (pre-renal), hyperglycemia, hypoalbuminemia, hyperlipidemia
• Electrolytes: Hypokalemia, hyponatremia common

Step 3: Lipase Testing (GOLD STANDARD)

• Dogs: Spec cPL (specific canine pancreatic lipase) - >400 mcg/L confirms pancreatitis; 200-400 mcg/L = equivocal. SNAP cPL for in-clinic screening.
• Cats: Spec fPL - >12 mcg/L suggests pancreatitis; >28 mcg/L confirms pancreatitis. SNAP fPL for in-clinic screening.

Step 4: Imaging

• Abdominal radiographs: Decreased contrast in cranial abdomen, "ground glass" appearance, duodenal displacement (dogs); usually normal (cats)
• Abdominal ultrasound: Preferred - hypoechoic pancreas, hyperechoic peripancreatic fat, free fluid, pancreatic enlargement

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PART 3 - SEVERITY ASSESSMENT

• Eating or able to eat with minimal support
• Mild dehydration only
• Spec cPL mildly to moderately elevated
• No systemic complications

• Profuse vomiting, unable to eat
• Moderate to severe dehydration
• Evidence of SIRS (2 or more: tachycardia/bradycardia, tachypnea, hypothermia/hyperthermia, abnormal WBC)
• Organ dysfunction (azotemia, hyperbilirubinemia, coagulopathy)
• Hypotension, shock

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PART 4 - STEP-BY-STEP TREATMENT PROTOCOL

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STEP 1: FLUID THERAPY (First Priority)

• Lactated Ringer's Solution (LRS) - preferred
• 0.9% NaCl - use if hyperkalemia present
• Plasmalyte - alternative isotonic option

• Calculate % dehydration (clinical estimate):
  • 5% = mild skin tenting, tacky mucous membranes
  • 8-10% = significant skin tenting, dry MM, sunken eyes
  • 12% = extreme skin tenting, shock signs
• Deficit (L) = body weight (kg) x % dehydration
• Replace deficit over 4-8 hours (if no cardiac contraindication)
• Add maintenance: ~60 ml/kg/day (dogs), ~40-50 ml/kg/day (cats)
• Add ongoing losses from vomiting/diarrhea

• Dogs: 10-20 ml/kg IV crystalloid bolus, reassess, repeat up to 90 ml/kg total
• Cats: 5-10 ml/kg IV bolus (cats are more sensitive - avoid fluid overload)

Current evidence supports moderate fluid resuscitation - give boluses only in response to hypovolemia indicators, not aggressive volume loading, to reduce fluid overload risk.

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STEP 2: ANALGESIA (Treat Aggressively - Do Not Undertreat)

Mild to Moderate Pain:

Note: Buprenorphine via OTM (oral transmucosal) is highly effective in cats - place under tongue or on oral mucosa.

Severe Pain - CRI (Continuous Rate Infusion):

Adjunct Analgesia (CRI add-ons for refractory pain):

Avoid NSAIDs (meloxicam, carprofen, etc.) - contraindicated due to GI adverse effects, risk of AKI in dehydrated patients, and impaired pancreatic perfusion.

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STEP 3: ANTI-EMETICS

First-Line:

Second-Line:

Maropitant is the preferred first-line antiemetic for both dogs and cats. It also provides some visceral analgesic benefit.

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STEP 4: NUTRITIONAL SUPPORT

Old approach (ABANDONED): "Gut rest" - NPO (nothing by mouth) for 24-72 hours. Current evidence-based approach: Early enteral nutrition as soon as the patient can tolerate it.

Why early feeding?

• Prolonged NPO causes mucosal atrophy, enterocyte apoptosis, gut barrier dysfunction, and bacterial translocation
• Early enteral feeding is well tolerated and leads to earlier voluntary food intake and fewer GI complications

Dogs - Feeding Protocol:

1. Mild pancreatitis: Offer small amounts of low-fat diet (< 20 g fat per 1,000 kcal) within 24 hours
2. Moderate/severe pancreatitis with vomiting: Once vomiting is controlled (24-48h), attempt oral feeding of low-fat diet in small frequent meals (4-6 x/day)
3. Cannot eat voluntarily: Place a nasoesophageal (NE) tube or esophagostomy tube for assisted enteral nutrition
4. Appetite stimulants: Capromorelin (Entyce) 3 mg/kg PO every 24 hours

Avoid high-fat treats, table scraps, or any fatty food during treatment and recovery.

Cats - Feeding Protocol:

1. Cats MUST eat to avoid hepatic lipidosis - feeding is urgent
2. Offer hydrolyzed protein diet (moderate fat restriction, not strict low-fat like in dogs)
3. Appetite stimulants:
   • Mirtazapine: 2 mg/cat PO or transdermally every 24 hours (preferred in cats)
   • Capromorelin (Elura): 2 mg/kg PO every 24 hours
4. If cat refuses food: nasogastric or esophagostomy tube feeding within 48-72 hours
5. Treat concurrent triaditis (cholangitis, IBD) simultaneously

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STEP 5: ANTIBIOTICS

• Confirmed aspiration pneumonia
• Evidence of septic peritonitis
• Documented bacterial infection (culture-positive)
• Suspicion of gastrointestinal bacterial translocation (severe, necrotizing pancreatitis with sepsis signs)
• Pancreatic abscess

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STEP 6: SPECIFIC TARGETED THERAPY (DOGS ONLY)

• Mechanism: LFA-1 inhibitor - blocks neutrophil extravasation into inflamed tissue, reducing early inflammatory cascade
• Indication: Acute-onset pancreatitis in dogs
• Dose: 0.4 mg/kg IV every 24 hours for 3 days
• Species: Dogs only (no feline approval)
• Status: FDA conditional approval (US) and licensed in Japan; reasonable expectation of effectiveness based on pilot studies

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STEP 7: ADDITIONAL / SUPPORTIVE MEDICATIONS

Proton Pump Inhibitors (PPIs):

• Not routinely recommended for pancreatitis unless specific indication (gastric ulceration, reflux esophagitis)
• Omeprazole: 1 mg/kg PO every 12-24 hours (dogs); 0.7 mg/kg PO every 24 hours (cats) - if indicated
• Pantoprazole: 1 mg/kg IV every 24 hours - IV option when PO not possible

Prokinetics (for GI ileus):

• Cisapride: 0.1-0.5 mg/kg PO every 8 hours - helps gastric emptying, esophageal sphincter tone; good for reflux esophagitis
• Erythromycin: 0.5-1 mg/kg PO/IV every 8 hours - low-dose prokinetic (motilin agonist)
• Use after adjusting opioid dose if ileus is suspected

Plasma/Fresh Frozen Plasma:

• Not routinely recommended
• Consider only in documented DIC (disseminated intravascular coagulation) or severe hypoproteinemia

Corticosteroids:

• Not routinely recommended for dogs
• Reserve for: Vasopressor-refractory hypotension, or when conventional therapy fails after ruling out contraindications
• Cats with chronic pancreatitis: Prednisolone 1-2 mg/kg PO every 24 hours, taper over weeks-months (cats are more responsive to immunosuppression); cyclosporine is an alternative per 2022 ACVIM data
• Dexamethasone for shock doses in critical patients: 0.1-0.2 mg/kg IV once

Electrolyte Supplementation:

• Potassium chloride (KCl): Add to IV fluids based on serum K+:
  • K+ 3.0-3.5: add 20 mEq/L
  • K+ 2.5-3.0: add 30 mEq/L
  • K+ 2.0-2.5: add 40 mEq/L
  • K+ < 2.0: add 60 mEq/L (do not exceed 0.5 mEq/kg/h infusion rate)
• Phosphorus: Supplement if hypophosphatemia detected

Vitamin B12 (Cobalamin):

• Cats frequently develop cobalamin deficiency with pancreatitis/IBD
• Cyanocobalamin: 250 mcg SC every 7 days for 4-6 weeks, then monthly
• Dogs: 250-1500 mcg SC weekly depending on weight

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STEP 8: MANAGEMENT OF UNDERLYING CAUSES

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PART 5 - MONITORING DURING TREATMENT

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PART 6 - SPECIAL CONSIDERATIONS: DOGS vs CATS SUMMARY

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PART 7 - DISCHARGE AND LONG-TERM MANAGEMENT

1. Continue low-fat diet (dogs) or hydrolyzed/moderate-fat diet (cats) long-term
2. Oral antiemetics (maropitant 2 mg/kg PO once daily) for 5-7 days if vomiting
3. Analgesia: Buprenorphine OTM for cats (5-20 mcg/kg every 8 hours) for mild ongoing pain at home; oral tramadol 2-5 mg/kg every 8-12 hours as additional option
4. Recheck Spec cPL/fPL in 2-4 weeks
5. Monitor for complications: Diabetes mellitus (post-pancreatitis), exocrine pancreatic insufficiency (EPI), pancreatic pseudocyst
6. Avoid high-fat diets, treats, table scraps permanently in dogs with recurrent pancreatitis
7. Cats: Monitor for and manage triaditis long-term; cobalamin supplementation if indicated

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Quick Drug Dosage Reference Card

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Disclaimer: This guide is intended for qualified veterinary professionals. All drug doses should be verified against current formularies and adjusted based on individual patient assessment, body weight, organ function, and clinical response. Consult a board-certified veterinary internist for complex or refractory cases.