(CNN) From New Hampshire to Oregon, researchers are trying to figure out what’s causing an infectious respiratory disease among dogs that has turned deadly in<a class="excerpt-read-more" href="https://wsvn.com/news/us-world/a-mysterious-respiratory-illness-is-spreading-among-dogs-and-baffling-veterinarians-heres-what-owners-can-do/">Read More</a>
The mysterious respiratory illness that may have sickened thousands of dogs across the country could be caused by a new type of bacterial infection, researchers say.