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Related Experiment Video

Updated: Feb 6, 2026

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Using Dog Scent Detection as a Point-of-Care Tool to Identify Toxigenic Clostridium difficile in Stool.

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  • 1Division of Infectious Diseases, Department of Medicine, Michael Garron Hospital, Toronto, Ontario, Canada.

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Summary

Trained dogs show potential for detecting toxin gene-positive Clostridium difficile in stool samples. However, modest agreement between dogs limits their widespread use as a point-of-care diagnostic tool.

Keywords:
C difficile detectioncanine olfactory capabilitiesinterrater reliabilityscent dog detection

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Area of Science:

  • Veterinary Diagnostics
  • Microbiology
  • Infectious Diseases

Background:

  • Clostridium difficile infection (CDI) is a significant healthcare-associated pathogen.
  • Accurate and rapid diagnostics are crucial for effective CDI management.
  • Novel point-of-care diagnostic methods are needed to improve CDI detection.

Purpose of the Study:

  • To evaluate the diagnostic performance of trained dogs for detecting toxin gene-positive Clostridium difficile.
  • To assess the operating characteristics, including sensitivity and specificity, of dogs as a point-of-care tool.
  • To determine the interrater reliability of canine olfactory detection of C. difficile.

Main Methods:

  • Two comparably trained dogs were utilized as diagnostic tools.
  • Dogs were presented with stool specimens from patients.
  • Operating characteristics (sensitivity, specificity) and interrater reliability (Cohen's kappa) were calculated.

Main Results:

  • The dogs demonstrated varying sensitivities (77.6% and 92.6%) and specificities (85.1% and 84.5%) in detecting toxin gene-positive C. difficile.
  • Interrater reliability between the two dogs was modest, with a Cohen's kappa of 0.52.
  • These results indicate potential but also limitations for canine-based diagnostics.

Conclusions:

  • Trained dogs show promise as a potential point-of-care diagnostic tool for C. difficile toxin genes.
  • The modest interrater reliability currently limits the widespread clinical application of this diagnostic approach.
  • Further research may be needed to improve the consistency and reliability of canine detection methods.