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All samples from positive COVID patients were taken from patients who had symptoms and all negative samples taken from patients who had no symptoms. So the dogs may not be detecting the presence of COVID, but instead presence of symptoms. All positive COVID samples were taken from hospitalized patients and all negative samples from non-hospitalized patients, so the dogs may not be detecting COVID, but whether it came from a hospitalized patient or nonhospitalized patient. Negative samples were all nasopharyngeal swabs, but some of the positive samples were taken from tracheobronchial secretions (from intubated patients, far deeper in the airways than a normal swab and absolutely not something you would perform on a non-critical ill patient). It's possible the dogs aren't detecting the presence of COVID, but the presence of tracheobronchial secretions. 

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