Another datapoint which sheds doubt on whether an outbreak is actually happening, here is a post from a top national lab of infectious disease, which gets samples from all over the country (we submit samples there all the time):

“The Texas A&M Veterinary Medical Diagnostic Laboratory (TVMDL) is closely following the available data for an unclassified respiratory disease affecting dogs in several states. Thus far, TVMDL has not seen an increase in canine respiratory cases submitted to the College Station or Canyon laboratories.”