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Like kennel cough, it is highly contagious among dogs and symptoms include coughing, sneezing, nasal or eye discharge and lethargy.

Rather, veterinarians make the determination when evaluating a dog who is suffering respiratory symptoms but tests negative on a panel of common diseases with similar symptoms, such as kennel cough.

The symptoms are similar to kennel cough, an upper respiratory infection, but can last much longer and, in some cases, prove fatal, according to veterinarians.

Experts say the illness at hand presents like “kennel cough,” a common canine condition, but appears to last longer and even be fatal in some cases.

Laboratories in at least four states are investigating a mysterious respiratory illness in dogs presenting similar symptoms to kennel cough, but they can last much longer, and in some cases prove fatal, according to veterinarians.