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Last I saw dogs could contract the virus but didn't present symptoms or pass it along. Simply based on the number of human cases and how few dog cases there are, one would assume they're relatively safe but we know so little about this virus's long-term effect even for asymptomatic carriers. I would be very interested to read the paper. Specifically, I was thinking that the dogs might be identifying a specific person rather than COVID. For example, if they used 20 unique COVID samples during training, the dogs might memorize the scent of the person during training. It will be fascinating to see how they set up their controls to eliminate any confounding variables.
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