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Case Summary & Diagnostic-Treatment Protocol — Hamza (2Y Male Husky)

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PATIENT DATA REVIEW

• Facial and head twitching (myoclonus)
• Hindlimb ataxia (HL leg)
• Inappetance
• Worms visible in stool
• Distemper PCR: Negative

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STEP-BY-STEP DIAGNOSTIC APPROACH

STEP 1 — Differential Diagnosis List

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STEP 2 — Additional Diagnostics Recommended

1. CSF analysis — protein, cells, PCR panel (distemper Ab titer in CSF > serum is more sensitive than PCR alone)
2. Serum distemper antibody titer (CSF) — even with negative PCR
3. Neospora caninum serology (ELISA or IFA)
4. Fecal floatation + direct smear — identify worm species (Toxocara, hookworm, Toxascaris, tapeworm)
5. MRI brain + spinal cord — if affordable
6. Serum B1 (Thiamine) level or empirical thiamine trial
7. Serum lead/heavy metal panel — rule out toxin
8. Reticulocyte count — to characterize anemia further

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STEP 3 — Working Diagnosis

Chronic helminthiasis with secondary neural larva migrans / nutritional deficiency + possible subclinical/late-stage distemper CNS sequelae (myoclonus)

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TREATMENT PROTOCOL — DETAILED WITH DRUG DOSAGES

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MODULE 1: ANTIPARASITIC TREATMENT

A. Fenbendazole (Panacur) — PREFERRED for neural larva migrans

• Dose: 50 mg/kg PO once daily × 5 consecutive days
• Repeat at Day 14 and Day 28
• Effective against: Toxocara canis, hookworm, whipworm, Giardia, some tapeworms
• Advantage: CNS-penetrating — useful if larval migration suspected

B. Pyrantel Pamoate (if roundworms/hookworms confirmed)

• Dose: 5–10 mg/kg PO, single dose; repeat in 2 weeks
• Safe, well-tolerated

C. Praziquantel (if tapeworm segments seen)

• Dose: 5 mg/kg SC/IM or PO, single dose
• Repeat in 2–3 weeks if needed

D. Combination Option — Drontal Plus (Praziquantel + Pyrantel + Febantel)

• Dose: 1 tablet per 10 kg PO once; repeat in 2–3 weeks
• Broad coverage

For Hamza (estimated ~25–30 kg Husky): Fenbendazole 50 mg/kg/day PO × 5 days is the primary choice.

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MODULE 2: NEUROLOGICAL MANAGEMENT

A. Phenobarbitone (for myoclonus/twitching control)

• Dose: 2–5 mg/kg PO BID (start at 2.5 mg/kg BID)
• Monitor serum phenobarb levels at 2 weeks; target 20–40 µg/mL
• Monitor ALT at 6 months (hepatotoxic long-term)
• Note: Myoclonus in distemper is often refractory — phenobarbitone provides partial control

B. Diazepam (acute severe twitching episodes only)

• Dose: 0.5 mg/kg IV or per rectum PRN for cluster twitching
• Not for chronic daily use

C. Potassium Bromide (add-on if phenobarb inadequate)

• Loading dose: 400–600 mg/kg PO divided over 5 days
• Maintenance: 30–40 mg/kg/day PO (in food)
• Takes 3–4 months to reach steady state

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MODULE 3: THIAMINE (Vitamin B1) — EMPIRICAL TRIAL

Thiamine (Vitamin B1)

• Dose: 50–100 mg/dog IM or SC once daily × 5 days, then PO maintenance
• PO maintenance: 50 mg/day in food
• Response within 24–48 hours confirms diagnosis
• Safe, cheap, diagnostic

Vitamin B Complex injection

• Dose: 1–2 mL IM/SC once daily × 5–7 days
• Covers B1, B6, B12

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MODULE 4: SUPPORTIVE CARE FOR ANEMIA & INAPPETANCE

A. Iron Supplementation (Microcytic Anemia)

• Ferrous sulphate: 100–200 mg/dog PO once daily × 4–6 weeks
• OR Iron dextran injection: 10–20 mg/kg IM once (especially if PO not feasible due to inappetance)

B. Appetite Stimulant

• Mirtazapine: 1.88 mg/dog (small dogs) to 3.75 mg (medium-large dogs) PO every 72 hours
• OR Cyproheptadine: 1.1 mg/kg PO BID

C. Liver Support (Prophylactic — on phenobarb)

• SAMe (S-Adenosylmethionine): 20 mg/kg PO once daily on empty stomach
• OR Silymarin (Milk Thistle): 50–70 mg/kg/day PO divided BID

D. Nutritional Support

• High-quality protein diet (chicken, egg — easily digestible)
• Hand-feeding or syringe feeding if inappetance persists
• Avoid raw food (helminth re-infection risk)

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MODULE 5: IF DISTEMPER CNS (MYOCLONUS) CONFIRMED

Prednisolone (immunomodulation — controversial but used in subacute CNS distemper)

• Dose: 1–2 mg/kg/day PO, taper over 4–6 weeks
• Only if no active systemic infection signs
• Monitor for immunosuppression

Supportive antioxidants:

• Vitamin E: 400 IU/day PO
• Omega-3 (Fish Oil): 1000 mg/day PO — neuroprotective

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COMPLETE TREATMENT SUMMARY TABLE

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MONITORING & FOLLOW-UP

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KEY CLINICAL NOTES

1. Distemper PCR negativity does not rule out CDV — PCR sensitivity drops significantly in the chronic CNS phase. CSF antibody titer is the gold standard for CNS distemper.
2. The leukopenia + lymphopenia pattern supports a previous viral insult (CDV classically causes lymphopenia) even with negative current PCR.
3. Myoclonus in distemper is almost always permanent — manage expectations with owner. It can be reduced but rarely eliminated.
4. Fenbendazole 5-day course is preferred over single-dose dewormers due to its CNS larval migration coverage and better efficacy against arrested larvae.
5. Thiamine trial is mandatory — it costs almost nothing and rules out a completely treatable cause of the entire neurological picture.
6. Maintain strict monthly deworming going forward and advise owner on environmental hygiene (worm egg contamination in yard/bedding).

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TREATMENT PROTOCOL — HAMZA (Husky, 2Y Male, ~25–30 kg)

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PHASE 1: IMMEDIATE (Day 1–5)

1. Thiamine (Vitamin B1) — FIRST PRIORITY, START DAY 1

Give thiamine before anything else — if neurological signs improve within 48 hours, thiamine deficiency was a contributing factor. Safe and diagnostic.

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2. Antiparasitic — BROAD SPECTRUM DEWORMING

• Fenbendazole is the drug of choice here — it penetrates the CNS and kills migrating larvae (Toxocara neural larva migrans)
• Praziquantel covers tapeworm if present alongside roundworms
• Repeat full fenbendazole course at Day 14 and Day 28

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3. Appetite Stimulant (for inappetance)

• Alternatively: Cyproheptadine 1.1 mg/kg PO BID if mirtazapine unavailable

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4. Iron Supplementation (Microcytic Anemia — MCV 62.7, HCT 29.2)

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PHASE 2: NEUROLOGICAL CONTROL (Day 1 onwards — long term)

5. Phenobarbitone — Myoclonus / Twitching Control

• Start at 2.5 mg/kg BID; can titrate up to 5 mg/kg BID if inadequate control
• Check serum phenobarb levels at Day 14 (target: 20–40 µg/mL)
• Check ALT every 6 months — phenobarb is hepatotoxic long-term

Important: CDV myoclonus is often permanent and only partially controlled by phenobarb. Counsel the owner accordingly.

6. Diazepam — Rescue Only (acute severe twitching clusters)

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PHASE 3: LIVER PROTECTION & NEUROPROTECTION (Day 1 onwards)

7. Liver Support (mandatory with long-term phenobarb)

8. Neuroprotective Antioxidants

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PHASE 4: IF CSF CONFIRMS CDV ENCEPHALITIS

9. Prednisolone (immunomodulation — subacute CNS distemper)

Only initiate after ruling out active systemic/respiratory infection. Do not use if secondary bacterial pneumonia is present.

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FULL DRUG SCHEDULE AT A GLANCE

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MONITORING SCHEDULE

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OWNER INSTRUCTIONS

1. Feed small, frequent, highly palatable meals — boiled chicken + rice until appetite normalizes
2. No raw meat/bones — eliminates re-infection with Toxocara/Neospora
3. Monthly deworming maintenance after completing the 3-cycle course
4. Keep yard clean — remove feces promptly; worm eggs survive in soil for years
5. The facial twitching may not fully resolve — this is a known outcome of CDV myoclonus; it can be managed but rarely cured completely
6. Do not miss phenobarb doses — abrupt discontinuation can trigger severe seizures

• B1 (Thiamine) 100 mg/mL
• B2, B3, B5, B6, B12 per vial (varies by formulation)

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Polybion Injection — Dosage for Hamza (14 kg Dog)

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Administration Notes

• IM site: Epaxial muscles (lumbar) or semimembranosus/semitendinosus muscle (hind limb)
• Give slowly — B vitamins can sting on injection
• Do not mix in the same syringe with other drugs
• Can be given SC if dog is fractious — absorption slightly slower but effective
• Assess neurological response at 48 hours — improvement in twitching or ataxia confirms B1 deficiency as a component

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For a 14 kg dog, 1 mL IM daily × 5 days is the standard clinical dose for Polybion injection. After 5 days, oral B-complex supplementation continues the correction without repeat injections.

• Thiamine (B1) — 100 mg/mL
• Pyridoxine (B6) — 100 mg/mL
• Cyanocobalamin (B12) — 1000 mcg/mL
• (Some formulations include B2, Niacinamide)

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Optineuron Injection — Dosage for Hamza (14 kg Dog)

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Why Optineuron is Good for This Case

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Administration Notes

• IM site: Lumbar epaxial muscle or semimembranosus (hindlimb)
• Inject slowly — B vitamins cause local stinging; rapid injection causes pain and muscle flinching
• Aspirate before injecting to confirm not in a vessel
• Alternate injection sites each day across the 5-day course
• Do not mix with other injections in the same syringe
• If dog is very fractious, SC is acceptable — slightly slower absorption

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Expected Response Timeline

If no improvement in neurological signs after 5 days of Optineuron, B-vitamin deficiency is not the primary driver — focus shifts to CDV CNS sequelae or Neospora, and phenobarbitone + further diagnostics become the priority.