Canine Pancreatitis: IV Treatment Protocol & Management

1. Initial Stabilization & IV Fluid Therapy

• Fluid of choice: Balanced isotonic crystalloid - Lactated Ringer's Solution (LRS) is preferred over 0.9% NaCl (alkalinizing effect theoretically reduces trypsin activation).
• Shock/hypoperfusion bolus: Quarter shock dose = ap. 15-20 mL/kg IV over 10-15 minutes, repeated as needed based on perfusion parameters (can go up to full shock dose 60-90 mL/kg in severe hypotension, given in aliquots).
• Rehydration + maintenance: Calculate deficit (% dehydration x body weight in kg x 1000 = mL deficit) + maintenance (~60 mL/kg/day) + ongoing losses (vomiting, diarrhea), replaced over 12-24 hours.
• Colloids: Consider synthetic colloids (e.g., hetastarch 10-20 mL/kg/day CRI) or plasma if hypoalbuminemia/coagulopathy (DIC risk) present.
• Electrolyte correction: Monitor K+, and supplement in fluids if hypokalemic (common with anorexia/vomiting); correct hypocalcemia if ionized calcium is low.
• Monitor with PCV/TS, lactate, blood pressure, urine output; avoid over-hydration in dogs with pre-existing cardiac disease.

2. Analgesia (Pain Control - Assume Pain Is Present)

• Buprenorphine: 5-30 mcg/kg IV, IM, or SC q4-6h
• Butorphanol: 0.2-0.4 mg/kg IV, IM, or SC q4h PRN
• Meperidine: 3-5 mg/kg IM/SC q2h PRN

• Morphine: 0.3-0.5 mg/kg IV slow loading, then 0.1-1 mg/kg/h IV CRI
• Fentanyl: 2-10 mcg/kg IV loading, then 2-10 mcg/kg/h IV CRI
• Methadone: 0.1-0.2 mg/kg IV loading, then 0.12 mg/kg/h IV CRI
• Multimodal "MLK" CRI for refractory pain: fentanyl + ketamine (4 mg/kg IV bolus) + lidocaine (2-4 mg/kg IV bolus, then 2-4 mg/kg/h CRI)

3. Antiemetics / Antinausea

• Maropitant (Cerenia): 1 mg/kg IV or SC once daily - first-line, also has visceral analgesic/anti-inflammatory benefit.
• Ondansetron: 0.5 mg/kg IV once, then q12-24h or as a 6-hour infusion if breakthrough nausea/vomiting.
• Metoclopramide: 1-2 mg/kg/day IV CRI (or 0.2-0.5 mg/kg SC/IV q6-8h) - second line; theoretical concern about reducing pancreatic/splanchnic blood flow, so maropitant/ondansetron generally preferred first.

4. Gastroprotectants (if GI ulceration/reflux suspected)

• Omeprazole: 1 mg/kg IV q12-24h, or
• Pantoprazole: 1 mg/kg IV q24h Used especially if hematemesis, melena, or significant reflux esophagitis risk.

5. Nutritional Support

• Offer a low-fat, easily digestible diet as soon as vomiting is controlled.
• If the dog will not eat voluntarily, place a nasoesophageal or esophagostomy tube for assisted feeding.
• Parenteral nutrition reserved for dogs with intractable vomiting who cannot tolerate any enteral feeding.

6. Antibiotics

7. Corticosteroids

8. Newer Targeted Therapy

• Fuzapladib sodium (Panoquell-CA1) - a LFA-1 antagonist that blocks neutrophil extravasation, preventing progression to SIRS/systemic inflammation. Conditionally FDA-approved in the US (licensed in Japan).
  • Dose: 0.4 mg/kg IV bolus over 15-60 seconds, once daily for 3 consecutive days.
  • Given alongside standard supportive care (fluids, analgesia, antiemetics), not as a replacement.

9. Anticoagulation / DIC monitoring

10. Monitoring Parameters

• Serial PE, hydration status, pain scoring (e.g., Glasgow Composite Pain Scale)
• CBC/chemistry, electrolytes, lactate, cPLI, glucose (watch for diabetes mellitus development), calcium, albumin
• Abdominal ultrasound to monitor for abscess, necrosis, or biliary obstruction
• Watch for complications: acute kidney injury, ARDS, DIC, diabetic ketoacidosis if concurrent diabetes develops

Summary of Evidence-Based Priority (per ACVIM consensus/WSAVA)

Canine Colitis: Management and Treatment Protocol

1. Diagnostic Workup (before committing to a drug protocol)

• Fecal exam (direct + flotation) and fecal antigen/PCR panel to rule out parasites (whipworms, Giardia), Clostridium perfringens, Cryptosporidium
• Diet history (recent food change, garbage ingestion, treats)
• If chronic/recurrent: rectal cytology, colonoscopy with biopsy to differentiate lymphocytic-plasmacytic colitis, granulomatous (histiocytic) colitis (Boxers/French Bulldogs - associated with invasive E. coli), or eosinophilic colitis

2. Acute Colitis - First-Line Management

• Diet first: Highly digestible, low-fat, low-residue GI diet (or bland home-cooked chicken/rice) for 3-7 days
• Fiber supplementation: Psyllium (1-3 tsp per meal depending on size) or pumpkin puree to normalize colonic motility and bulk stool - shown effective in the same RCT
• Deworming: Fenbendazole 50 mg/kg PO q24h for 3-5 days if whipworms/parasites are suspected or not recently ruled out
• Probiotics: Veterinary-specific strains (e.g., Enterococcus faecium, Bifidobacterium animalis) may help shorten duration
• Antibiotics/metronidazole: No longer recommended as routine first-line therapy for uncomplicated acute colitis; reserve for confirmed bacterial pathogens (e.g., invasive E. coli-associated granulomatous colitis) or systemic signs of sepsis
• Avoid NSAIDs - not safe in colonic inflammation

3. Chronic Colitis / Colonic IBD Management

• Novel-protein or hydrolyzed-protein elimination diet trial for 2-4 weeks (many "chronic colitis" cases are actually food-responsive)
• Fiber-supplemented diet if food trial doesn't resolve signs

• Metronidazole: 10-15 mg/kg PO q8-24h - useful if anaerobic/dysbiotic component suspected, but per current evidence should not be first-line and courses should be kept short (dysbiosis risk)
• Tylosin: 20 mg/kg PO q8-12h - alternative, used particularly for tylosin-responsive diarrhea
• Sulfasalazine (colon-specific 5-ASA): 10-25 mg/kg PO q8h (TID) for 4-6 weeks, then taper 25% every 2 weeks while maintaining diet - good for lymphocytic-plasmacytic colitis; monitor for keratoconjunctivitis sicca (tear production) with long-term use
• Mesalamine: 12.5 mg/kg PO q12h (alternative 5-ASA, less hepatic/renal concern than sulfasalazine in some cases)

• Prednisone/prednisolone: 1-2 mg/kg PO q24h (Merck Vet Manual) or q48h once tapering, tapered gradually over weeks to lowest effective dose
• Budesonide (preferred if minimizing systemic steroid effects, e.g., in Boxers/concurrent disease): 3 mg/m² PO q24h - high first-pass hepatic metabolism limits systemic side effects
• Azathioprine: 2 mg/kg (or 50 mg/m²) PO q24h for 2 weeks, then taper to q48h - for refractory immune-mediated colitis, monitor CBC for myelosuppression
• Cyclosporine: 5 mg/kg PO q24h for 4-6 weeks, then taper to lowest effective dose - option for steroid-refractory cases

• Enrofloxacin: 10-20 mg/kg PO q24h for 6-8 weeks is the treatment of choice (fluoroquinolones concentrate well in colonic macrophages) - often curative, in contrast to steroids which historically had poor response in this specific subtype.

4. Supportive/Symptomatic Care

• Anti-diarrheals: loperamide (0.1 mg/kg PO q8h) used cautiously - avoid if infectious cause not ruled out
• Ensure adequate hydration - oral or SC/IV fluids if dehydrated from severe diarrhea
• Address underlying stress/environmental triggers in stress-associated colitis (common in anxious/kenneled dogs)

Monitoring

• Reassess stool quality/frequency and body weight every 1-2 weeks during treatment changes
• For dogs on chronic sulfasalazine or steroids: periodic bloodwork (CBC/chem) and tear production (Schirmer tear test for sulfasalazine)
• Colonoscopy with biopsy recommended if no response to a structured 4-8 week diet + drug trial, to rule out neoplasia (colonic adenocarcinoma, lymphoma) or refractory IBD needing escalation

Key Practical Takeaway