Dog Pneumonia Outbreak 2025. Canine respiratory infections, especially dog flu, are common, often causing outbreaks in shelters and doggy day cares. The outbreak of atypical canine infectious respiratory infectious disease complex (acirdc) that grabbed the nation’s attention late last year appears to be receding.
Veterinary experts aren’t sure what’s causing dogs to become sick or even how to. Dogs around the country are becoming sick with an unknown respiratory illness.