Post-Prandial Shivering in a 35-Day-Old Puppy - Possible Causes

1. Congenital Portosystemic Shunt (PSS) / Hepatic Encephalopathy - Most Likely

• In a PSS (liver shunt), an abnormal blood vessel bypasses the liver, so dietary proteins are absorbed from the gut and their toxic metabolites (primarily ammonia) are not cleared by the liver
• These toxins go directly to the brain, causing hepatic encephalopathy (HE) - which presents as tremors, lethargy, aimless wandering, head pressing, or seizures
• Crucially, symptoms worsen AFTER eating because food intake triggers a spike in ammonia and other toxins
• Toy breeds (Yorkies, Maltese, Pugs, Miniature Schnauzers) are most commonly affected, but any breed/mix can have this condition
• Wisconsin Veterinary Neurology notes that "symptoms often worsen after eating" as a hallmark sign

2. Neonatal/Juvenile Hypoglycemia - Very Common in Puppies This Age

• At 35 days, puppies have immature glucose regulation and very limited glycogen stores
• Paradoxically, eating itself can trigger reactive hypoglycemia in fragile pups - a surge in insulin outpaces glucose supply
• Signs: tremors, muscle twitching, weakness, lethargy, pale mucous membranes, and in severe cases, seizures
• PMC review on hypoglycemia in dogs lists "muscle tremors/fasciculations" and "altered mentation" as key signs of neuroglycopenia
• A PSS can also directly cause hypoglycemia by impairing hepatic gluconeogenesis

3. Gastrointestinal Pain / Nausea

• Shivering is a classic pain response in dogs
• The puppy may be experiencing gastric cramping, gas, bloating, or esophageal/GI discomfort post-feeding
• This is less serious than the above but still requires investigation

4. Cold / Thermoregulatory Failure

• Neonates up to 4 weeks have poor thermoregulation; at 35 days it's improving but still immature
• Eating triggers increased blood flow to the gut (splanchnic circulation), which can briefly divert heat from the periphery
• However, given the strict post-prandial pattern, a metabolic cause is far more likely

5. Milk Protein Intolerance / Food Sensitivity

• If transitioning to solid food or different milk, intolerance reactions can cause GI distress and shivering
• Less likely to cause neurological-appearing tremors

Recommended Workup

CBC Analysis - SULTAN (Dog) | 23 Jul 2026

Extracted Values & Flags

Key Abnormalities - The CBC Pattern

1. Severe Thrombocytopenia - PLT 71 × 10³/µL (normal 200-500), confirmed by PLT histogram flag <5
2. Microcytic Anemia - HCT low at 34%, MCV very low at 59.5 fL with anisocytosis (AT flag on RBC histogram)
3. Absolute Lymphocytosis - LY 4.9 × 10³/µL with 33.6%
4. Eosinopenia - EO 0.6% (low), a classic stress/infectious response

#1 Highest Differential: Canine Ehrlichiosis (Ehrlichia canis)

Other Differentials to Rule Out

Recommended Next Steps

1. Blood smear examination - Look for morulae (E. canis inclusions) inside monocytes/lymphocytes
2. E. canis serology (IFA/ELISA) - Most reliable confirmatory test
3. PCR for Ehrlichia spp. - High sensitivity, can be run on whole blood
4. Tick search - Rhipicephalus sanguineus (brown dog tick) is the main vector
5. Treatment: If clinical suspicion is high, start Doxycycline 10 mg/kg/day PO for 28 days - do not wait for confirmatory results in a sick dog

Note: This also connects with the previous case (Sultan may be the same dog as the puppy with post-prandial shivering) - Ehrlichia can also cause neurological signs in dogs through vasculitis and thrombocytopenia-associated hemorrhage, making this diagnosis even more important to confirm urgently.

CBC - SULTAN (Dog) | Key Abnormalities

#1 Highest Differential: Canine Ehrlichiosis (Ehrlichia canis)

• Severe thrombocytopenia (PLT 71) - hallmark finding
• Mild microcytic nonregenerative anemia (HCT 34, MCV 59.5)
• Lymphocytosis - classic in acute-phase CME, can mimic lymphocytic leukemia
• Eosinopenia - classic for rickettsial tick-borne disease

Other Differentials

Immediate Action

1. Blood smear - look for morulae in monocytes
2. E. canis serology (IFA/ELISA) or PCR
3. Start Doxycycline 10 mg/kg/day × 28 days if clinical suspicion is high - do not wait for results in a symptomatic dog
4. Tick search and deworming - Rhipicephalus sanguineus is the primary vector

CBC Analysis - SIMBHA (Dog 0003) | 23 Jul 2026, 13:35

Extracted Values & Flags

Key Pattern - This is NOT the same as Sultan

#1 Highest Differential: Immune-Mediated Hemolytic Anemia + Immune-Mediated Thrombocytopenia (Evans Syndrome)

Why this is the top diagnosis:

1. PLT 4.3 × 10³/µL - Life-threatening thrombocytopenia (normal: 200-500). This is 98% below normal. Only immune-mediated thrombocytopenia (ITP) or severe bone marrow failure causes PLT this catastrophically low.
2. High MCHC (37.1 g/dL) + High MCH (24.6 pg) - This is the hallmark of spherocytosis. When the immune system destroys RBC membranes, cells lose surface area, become spherocytes, and pack more hemoglobin per volume → MCHC rises. This is the fingerprint of Immune-Mediated Hemolytic Anemia (IMHA).
3. Leukopenia (WBC 4.66) - Combined with severe thrombocytopenia and anemia = near-pancytopenia, suggesting either:
   • Concurrent immune-mediated neutropenia (full Evans Syndrome), or
   • Bone marrow suppression
4. Anisocytosis (AT flag) on RBC histogram - Mixed RBC sizes consistent with ongoing hemolytic process + possible regenerative response

Other Critical Differentials

⚠️ This Dog is in Danger - Immediate Action Required

Emergency Steps:

1. Blood smear STAT - look for spherocytes (IMHA), piroplasms (Babesia), schistocytes (DIC)
2. Coombs test (DAT) - confirms IMHA
3. Babesia PCR/smear - critical given Indian subcontinent context
4. Coagulation panel (PT, aPTT, D-dimers) - rule out DIC
5. If IMHA/ITP suspected: Start Prednisolone 2 mg/kg/day immediately
6. If Babesia suspected: Imidocarb dipropionate 6.6 mg/kg IM x2 doses, 14 days apart
7. Platelet-rich plasma or whole blood transfusion if bleeding occurs
8. Strict cage rest - no venipuncture from jugular, no rough handling

Babesia gibsoni is far more suspected in SIMBHA

Head-to-Head Comparison

Why Every CBC Finding Points to B. gibsoni

1. PLT of 4,300/µL - Catastrophic thrombocytopenia

2. High MCHC (37.1) = Spherocytosis = B. gibsoni signature

3. Leukopenia (WBC 4.66) + near-pancytopenia

4. Indian subcontinent context

Confirmatory Tests

Treatment for B. gibsoni (NOT the same as B. canis)

⚠️ This matters - B. gibsoni does NOT respond well to imidocarb dipropionate alone (which works for B. canis).

• Atovaquone 13.3 mg/kg PO q8h × 10 days + Azithromycin 10 mg/kg PO q24h × 10 days (AA protocol - most effective)
• Alternative: Combination of Diminazene aceturate + Doxycycline + Prednisolone (if atovaquone unavailable)
• Prednisolone 1-2 mg/kg/day if immune-mediated hemolysis component is significant
• Supportive care: IV fluids, blood transfusion if HCT falls below 20%