The infected dogs develop a cough, fever, lethargy and intermittent loss of appetite.
Though there is no official count of the number of infections, veterinarians said they have treated more dogs with these symptoms in the last few months.
Dr. Lindsey Ganzer, a veterinarian and chief executive at North Springs Veterinary Referral Center in Colorado Springs, Colo., said that she has treated about 35 dogs with the illness since late October.
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