I did not know that dogs get the flu! "But these coughs seemed to linger, and the handful of hacking dogs soon turned into dozens. By mid-November, 86 percent of the shelter’s roughly 150 dogs were ill." It's canine influenza, which doesn't affect humans. https://www.nytimes.com/2022/12/02/health/dogs-canine-flu.html?smid=tw-share