Short answer: Canine distemper virus (CDV) is a paramyxovirus that affects the GI, respiratory, and central nervous systems. Unvaccinated puppies are at highest risk. Mortality is 50% in dogs; survivors often have permanent neurologic damage. The DAPP vaccine prevents it.
🚨 Red flag — call your vet now if: unvaccinated puppy with fever + GI signs + respiratory signs – emergency vet visit.
What you should actually do
- Transmission: aerosol contact from infected dogs and wildlife (raccoons, ferrets, skunks).
- Multisystem signs: fever, nasal/ocular discharge, cough, vomiting, diarrhea, then seizures, ataxia, myoclonus.
- Classic late sign: nasal/footpad hyperkeratosis (‘hard pad disease’).
- Diagnosis: PCR on conjunctival/respiratory swab; antibody titers.
- Treatment: supportive care; no specific antiviral. Many die or have lifelong neurologic deficits.
Distemper is the ‘D’ in DAPP. The vaccine is highly effective and the disease is rare in adequately vaccinated populations – but outbreaks still occur in shelter populations, rural areas, and where vaccination is inadequate.
Wildlife reservoirs (raccoons especially) mean vaccination remains essential. Distemper has been implicated in mountain lion and red panda deaths.
Dig deeper
⚕️ Medical Disclaimer
The information on this page is intended for educational purposes only and does not replace a hands-on veterinary examination. Drug doses depend on your dog’s complete clinical picture, concurrent medications, and the exact product formulation. Always confirm dosing with your veterinarian before administering any medication, and contact a 24-hour veterinary emergency service or animal poison control immediately if you suspect a medication overdose or adverse reaction. Editorial standards: every drug dose published on PuppaDogs is cross-checked against multiple authoritative veterinary references and reviewed by PuppaDogs Veterinary Editorial Team before publication.
