Controller-approved source entry - manual-review caution required
Canine
Infectious / Neurologic
Manual reviewNeuroinfectious emergency
Canine Pseudorabies, Tetanus, and Neuroinfectious Emergencies
Separate hog-exposure pruritic encephalitis, wound-associated rigidity, rabies-mimic safety, and neurologic differentials before choosing the next best step.
⏱ 8-10 min read · Topic 48 of 128
5
Practice Qs
8
Traps
Medium
Exam freq.
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Your status
Study step
High-yield takeaways
- Recognize the classic presentation, then narrow the case using signalment, timeline, exam findings, diagnostics, and response to treatment.
- Use the decision framework, traps, differentials, and related questions to rehearse NAVLE-style next-best-step reasoning.
- This educational study page is not a clinical protocol; confirm patient-specific decisions with current references and clinician judgment.
30-second revision
PseudorabiesHog exposure plus severe pruritus and neurologic signs is the core recognition pattern.
Rabies mimicPseudorabies is not rabies, but safety and official diagnostic handling cannot be skipped.
TetanusWound plus progressive rigidity and stimulus-sensitive spasms beats a seizure-only label.
Treatment logicTetanus management is source control plus supportive care; pseudorabies is usually recognition/safety/poor-prognosis logic.
BoundaryNo doses, reporting protocol, or antitoxin schedule from memory.
How NAVLE tests this topic
Board mindset → These stems test syndrome recognition and safe sequencing: rabies-mimic precautions for pseudorabies; wound/source control and supportive care for tetanus.
Pseudorabies pearl → A hog-hunting dog with intense localized pruritus and rapid neurologic decline is not an allergy case; prognosis is poor and rabies-mimic handling matters.
Tetanus pearl → A puncture wound followed by progressive rigidity is a toxin-mediated neuromuscular emergency, not a seizure diagnosis.
Differential pearl → Rabies, distemper, strychnine, hypocalcemia, meningitis, tick paralysis, and focal pain can overlap; the exposure and motor pattern choose the branch.
Emergency Triage Alert
Neurologic Infection Or Toxin-Mediated Rigidity Changes Handling
Severe neurologic signs, dysphagia, respiratory compromise, self-mutilation, hyperesthesia, or progressive rigidity require immediate safety, low-stress handling, and veterinarian-directed escalation before routine outpatient treatment.
Rabies-Mimic Safety Note
Do not handle pseudorabies-like cases as routine itch or routine seizure disease
Pseudorabies is not rabies, but affected dogs can show salivation, behavior change, paralysis, seizures, and rapid decline. A suspected case with possible human or animal exposure should be handled through veterinarian-directed safety, diagnostic, and official-channel guidance.
Reportable Disease
Pathophysiology that changes decisions
Pseudorabies pathway → Suid herpesvirus exposure from infected swine or feral hog material can cause rapidly progressive neurologic disease in dogs, often with intense pruritus and self-trauma.
Rabies-mimic pathway → Pseudorabies is not rabies, but salivation, behavior change, paralysis, and encephalitic signs can resemble rabies enough that staff safety and official diagnostic sequencing matter.
Tetanus pathway → Clostridium tetani spores introduced into anaerobic wound tissue produce neurotoxin; toxin effects create sustained muscle rigidity and spasms.
Why timing matters → Tetanus therapy aims to stop further toxin production and support the patient while bound toxin effects resolve; pseudorabies cases often decline too quickly for curative treatment.
Differential overlay → Strychnine toxicosis, hypocalcemia, rabies, distemper, meningitis, tick paralysis, and painful orthopedic disease can mimic pieces of these patterns.
Manual-review caution: verify current diagnostic submission, isolation, antitoxin, antimicrobial, sedation, nutritional support, ventilation, and public-health decisions with current veterinary and official sources.
Key clinical patterns
Core pattern
hog-hunting dog, feral swine exposure, raw pork/offal exposure, or farm dog exposed to swinesudden severe facial or localized pruritus, self-trauma, salivation, behavior change, seizures, ataxia, paralysis, or rapid deathdeep puncture wound, penetrating foreign body, contaminated wound, necrotic tissue, or recent surgery/injury followed by stiffnessprogressive rigidity, trismus, sardonic facial expression, erect ears, stiff gait, hyperesthesia, extensor spasms, dysphagia, or respiratory compromiseexam stem asks for safest next step rather than final drug dose
Supporting clues
exposure: feral hog/raw pork versus wound contaminationmotor pattern: pruritic encephalitis versus sustained rigidity/spasmhandling risk: rabies mimic, staff exposure, low-stress dark/quiet environmentwound/source control versus diagnostic submission and official-channel cautionrespiratory, swallowing, nutrition, hydration, and recumbency support needs
NAVLE trigger: Match exposure and motor pattern first; then choose safety, containment, wound/source control, and supportive-care escalation rather than a memorized protocol.
Decision framework - what NAVLE asks
Hog exposure plus mad itch and neurologic signs
Treat as a rabies-mimic neurologic emergency: protect staff, minimize handling, isolate as appropriate, and pursue veterinarian-directed official/lab guidance rather than allergy or routine seizure management.
Puncture wound plus progressive rigidity
Think tetanus: find and address the wound/source, reduce stimulation, control spasms/support ventilation as needed, and use clinician-guided antitoxin/antimicrobial/supportive planning.
Active seizure without pruritus or wound rigidity
Stabilize seizure activity and screen reactive/structural causes, but do not force pseudorabies or tetanus when the core exposure pattern is absent.
Possible rabies exposure
If bite/exposure history or compatible behavior raises rabies concern, do not shortcut official handling because another differential seems likely.
Stable localized stiffness
Localized tetanus can progress; reassess frequently and use current references for wound care, antitoxin, antimicrobial, and supportive-care decisions.
Diagnostic priorities and interpretation
Feral hog exposure
Pseudorabies anchor
Hunting or swine exposure plus rapid pruritic neurologic decline is the tested recognition pattern.
Severe pruritus/self-trauma
Not allergy
Sudden intense localized itch with neurologic signs should not be treated as dermatology only.
Rabies test/handling need
Safety anchor
Pseudorabies can look rabies-like; staff safety and official diagnostic sequence matter.
Puncture wound
Tetanus anchor
A small wound may be missed; search carefully when rigidity follows trauma.
Trismus/rigidity
Spasm pattern
Sustained rigidity and stimulus-sensitive spasms support tetanus over recurrent seizure alone.
Respiratory or swallowing compromise
Escalation trigger
Airway, aspiration, nutrition, hydration, and recumbency risk can dominate management.
Do not provide fixed clinical protocols from memory. Use current references for diagnostic submission, antitoxin availability, antimicrobials, sedation, muscle-relaxant support, and local official instructions.
Treatment escalation and management logic
Immediate safety
Use low-stress handling, protect staff, prevent injury, and escalate neurologic emergencies promptly.
Rabies-mimic signs require stricter safety thinking than routine neurology cases.
Pseudorabies branch
Recognize feral-hog/swine exposure plus severe pruritic neurologic decline; isolate/handle cautiously and follow veterinarian-directed official or laboratory guidance.
This page does not provide diagnostic submission protocol or legal reporting instructions.
Tetanus source control
Find, open, clean, drain, or debride the wound as directed; reduce further toxin production with clinician-guided antimicrobial and wound management.
No wound procedure, antimicrobial dose, or antitoxin dose is supplied.
Tetanus toxin/support
Clinician-guided antitoxin may be used for unbound toxin; quiet environment, sedation/muscle-relaxant support, nutrition, hydration, nursing, and ventilation monitoring may be central.
Bound toxin effects resolve over time; supportive care intensity drives outcome.
Prevention and counseling
Discuss wound care, vaccination/booster decisions where relevant, hunting/swine exposure prevention, and clear return or referral triggers.
Use current veterinary guidance and local disease-control instructions.
NAVLE traps — where students lose marks
Treating mad itch as allergy
Sudden severe self-trauma after hog exposure is a neurologic infectious clue, not a simple dermatology problem.
Forgetting rabies-mimic precautions
Pseudorabies can resemble rabies clinically; safety and official diagnostic handling matter even when pseudorabies is suspected.
Calling tetanus a seizure disorder
Tetanus produces sustained rigidity and stimulus-sensitive spasms linked to wound history.
Missing a small puncture wound
The original wound may be minor, hidden, or partly healed by the time rigidity appears.
Medication-only tetanus thinking
Wound/source control, low-stimulation care, nursing, nutrition, and respiratory monitoring are core branches.
Overpromising pseudorabies treatment
In dogs, disease is usually rapidly progressive and fatal; the exam often tests recognition and safety rather than cure.
Skipping differential toxicology
Strychnine and other toxidromes can mimic rigidity or seizures and need history-based separation.
Giving protocol certainty
Antitoxin, antimicrobial, sedation, ventilation, and official-channel details depend on current references and case context.
Differential diagnosis framework
NAVLE discriminator: exposure plus motor pattern chooses the branch: hog exposure and pruritic encephalitis points pseudorabies; wound plus rigidity points tetanus.
| Lane | High-value clue | Best decision bias | Common trap |
|---|---|---|---|
| Pseudorabies/Aujeszky disease | Hog-hunting or swine exposure, severe localized pruritus/self-trauma, salivation, behavior change, ataxia, seizures, paralysis, rapid decline | Rabies-mimic safety, cautious handling, official/lab diagnostic guidance, poor prognosis communication | Treating as allergy, otitis, or routine seizure |
| Generalized tetanus | Deep puncture/contaminated wound followed by progressive rigidity, trismus, erect ears, hyperesthesia, extensor spasms | Wound/source control, low-stimulation supportive care, clinician-guided antitoxin/antimicrobial/spasm support | Calling it epilepsy or skipping wound search |
| Rabies | Acute behavioral change, bite/exposure risk, progressive neurologic signs, salivation or paralysis | Official public-health handling and staff exposure protection | Dismissing rabies because another differential is plausible |
| Strychnine or stimulant toxicosis | Acute severe spasms or seizures, exposure history, stimulus sensitivity without wound timeline | Toxicology triage, decontamination timing, seizure/spasm stabilization | Forcing tetanus without wound context |
| Distemper or inflammatory CNS disease | Respiratory/ocular/GI history, age/vaccine risk, multifocal neurologic progression | Isolation, diagnostics, supportive care, prognosis discussion | Ignoring infectious context |
| Localized pain or orthopedic disease | Focal stiffness/pain without generalized rigidity, pruritic encephalitis, or systemic neurologic decline | Localize pain and reassess if progression develops | Overcalling tetanus from any stiffness |
Calculator applications and clinical tools
Use these adjacent pages and tools to compare neurologic emergency, infectious, and toxicologic branch sorting:
Related questions
Practice canine neuroinfectious emergency branch sorting
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A hog-hunting dog develops sudden severe facial pruritus with self-trauma, hypersalivation, ataxia, and seizures one day after contact with feral swine. Which next-step framing is safest?
A dog has progressive stiffness, trismus, erect ears, and stimulus-sensitive extensor spasms several days after a contaminated puncture wound. What is the best treatment concept?
Which clue most strongly separates pseudorabies from uncomplicated allergy in a dog with facial scratching?
A neurologic dog with salivation and behavior change has possible feral hog exposure. Rabies vaccination and bite history are uncertain. What is the most important caution?
A dog with a small healed paw puncture becomes stiff, hyperesthetic, and has difficulty opening the mouth. Which answer avoids a common trap?