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Canine Distemper
Canine distemper virus (CDV)
A highly contagious and often fatal viral disease affecting the respiratory, gastrointestinal, and nervous systems. Vaccination is highly effective at prevention.
Last updated: 2026-05-08
Severity
severe
When to Act
🚨 Immediate Emergency Care
Symptoms & Signs
Thick nasal and eye discharge
Initially watery, progressing to thick yellow/green pus-like discharge from eyes and nose.
Fever
Biphasic fever pattern — initial spike, brief recovery, then second higher fever.
Coughing and pneumonia
Dry cough progressing to productive cough; secondary bacterial pneumonia is common.
Vomiting and diarrhea
GI signs often accompany the respiratory phase.
Neurological signs
Muscle twitching, seizures, chewing gum fits, partial or complete paralysis — may appear weeks after apparent recovery.
Hard pad disease
Thickening and hardening of footpads and nose leather in chronic cases.
Behavioral Changes to Watch For
Pets can't tell us what's wrong. These behavioral changes are often the first clues that something is wrong.
🐾 Depression and lethargy
Profound mental dullness; the dog appears disconnected from surroundings.
What You May Notice:
Your normally alert dog seems "out of it," doesn't respond to their name, and sleeps constantly.
🐾 Compulsive repetitive behaviors
Neurological form causes involuntary muscle twitching or "chewing gum" jaw motions.
What You May Notice:
Your dog's leg or face twitches uncontrollably, or they make repetitive jaw movements even when awake.
Causes & Risk Factors
Causes
- •Infection with canine distemper virus (CDV), a Morbillivirus related to human measles
- •Airborne transmission via respiratory droplets from infected dogs
- •Direct contact with infected urine, feces, or saliva
- •Transplacental transmission from mother to puppies
Risk Factors
- ⚠Unvaccinated puppies 3-6 months old
- ⚠Shelter or kennel environments with high dog density
- ⚠Dogs in areas with high stray populations
- ⚠Immunocompromised dogs
How It's Diagnosed
- 1Clinical signs and vaccination history
- 2PCR testing on conjunctival/nasal swabs or CSF
- 3Complete blood count (lymphopenia common)
- 4Chest radiographs for pneumonia assessment
- 5CSF analysis if neurological signs present
Treatment Options
Intensive Supportive Care
No specific antiviral exists — treatment is entirely supportive.
Steps
- 1.IV fluids to maintain hydration
- 2.Broad-spectrum antibiotics for secondary bacterial infections
- 3.Antiemetics for vomiting control
- 4.Nutritional support via feeding tube if needed
- 5.Anticonvulsants (diazepam, phenobarbital) for seizures
- 6.Nebulization and coupage for respiratory cases
Expected Outcome
Variable; recovery possible but neurological damage may be permanent.
Precautions
- !Isolation is critical — CDV is highly contagious
- !Neurological signs may progress even as other symptoms improve
Common Medications Used
| Medication | Usage | Important Notes |
|---|---|---|
| Diazepam | Control of seizures and muscle twitching | Used for acute seizure management in the neurological phase. |
Prevention
- ✓Core DHPP vaccination starting at 6-8 weeks, boosters every 3-4 weeks until 16 weeks
- ✓Adult boosters per veterinary guidelines (typically every 1-3 years)
- ✓Isolate infected dogs immediately
- ✓Avoid contact with wildlife (raccoons, foxes, skunks are reservoirs)
When to See a Veterinarian
- 🚨Any respiratory signs + fever in an unvaccinated dog
- 🚨First seizure or muscle twitching
- 🚨Thick eye/nose discharge
Frequently Asked Questions
Can a dog survive distemper?
Prognosis
Guarded to poor. Mortality rate is 50-75% overall, higher in puppies and when neurological signs develop. Survivors often have permanent neurological deficits (seizures, muscle twitching).
References
- [1] Merck Veterinary Manual — Canine Distemper
- [2] WSAVA Vaccination Guidelines
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