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Dysosmia caused by encephalitis in a dog.

S T Simpson1, L J Myers

  • 1Department of Small Animal Surgery and Medicine, College of Veterinary Medicine, Auburn University, AL 36849-3501.

Journal of the American Veterinary Medical Association
|December 15, 1987
PubMed
Summary

A young Beagle experienced sudden olfactory dysfunction, impacting its hunting ability. Mild encephalitis was diagnosed, suggesting canine distemper encephalitis as a potential cause for the altered sense of smell.

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Area of Science:

  • Veterinary Neurology
  • Olfactory Neuroscience

Background:

  • Disorders of the sense of smell (dysosmia) can significantly impact a dog's behavior and capabilities.
  • Canine distemper virus is a significant pathogen affecting the central nervous system in dogs.

Observation:

  • A 1- to 2-year-old Beagle, previously successful in field trials, presented with a sudden loss of ability to detect rabbits.
  • Clinical examination revealed mild encephalitis with a partial response to odors.
  • Specialized olfactory testing showed some residual sense of smell, but with inappropriate behavioral responses.

Findings:

  • The Beagle exhibited dysosmia, characterized by an impaired and inappropriate response to olfactory stimuli.
  • Mild encephalitis was evident, suggesting a neurological basis for the olfactory deficit.

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  • Canine distemper encephalitis was suspected as the underlying cause of the observed dysosmia.

    • Implications:

    • This case highlights the potential for canine distemper encephalitis to cause significant olfactory dysfunction in dogs.
    • Understanding the neurological basis of dysosmia is crucial for accurate diagnosis and treatment in veterinary neurology.
    • Further research into the specific effects of canine distemper on the olfactory system is warranted.