Mystery Dog Illness Update 2024. A mysterious canine illness is spreading throughout the country that can linger for months, cause fever, pneumonia and, in rare cases, death. Veterinary diagnostic laboratories work to determine the source of mystery illness.
A mysterious illness that causes fever, cough and lethargy in dogs has now spread to at least 16 states, the louisiana state university school of veterinary. In recent months, concern has risen among dog owners regarding a mysterious respiratory illness affecting their canine companions.