Causes can include:Bordetella 101: Kennel cough and your dog Feline Upper Respiratory Infection Canine Influenza Does a Dry Nose Equal A Sick Dog? Why is My Cat Sneezing? Outbreak of Canine Influenza Virus in Chicago: Is Your Dog at Risk? Chicago's Mystery Dog Virus Outbreak Identified as Asian Strain How Can You Reduce Your Cat's Stress at Home? Do Cats Get Colds?