My dog has labored breathing, cough, wheezing, runny nose, occasional sneeze; seems bronchitis; 3 months old, male, unneutered, Samoyed-Bichon mix.

A dog’s cough and wheezing may come from pneumonia, respiratory infection, mycoplasma, bacteria, or distemper, and also from an enlarged heart, heart disease, or poor cardiac supply. Take the dog to a vet to find the cause and treat accordingly. After diagnosis, medicate strictly per the vet’s instructions to avoid chronic bronchitis or acute pneumonia from delay.