The dog flu is coming, Las Vegas veterinarians say. A new-to-the-U.S. strain of the canine influenza, H3N2, has been detected in Northern Nevada for the first time, according to DogFlu.com. There have been 52 cases confirmed this month. Vets usually only recommend the vaccine for dogs traveling to an area where the flu was present. But this year, many vets are telling pet owners it’s better to be safe than sorry. Local veterinarians say they haven’t seen either flu strain in Las Vegas yet, but warn it’s just a matter of time. Symptoms resemble kennel cough, or even the human flu: coughing, sneezing, fever and lethargy. And like the human flu, dog flu can kill. Dr. Travis McDermott, hospital director at Durango Animal Hospital