SEATTLE — Dog owners should keep an eye on their pets' coughs, Washington's state veterinarian warns, as an unidentified respiratory canine illness spreads across the nation. No cases of the illness in Washington have been reported as of Tuesday, but it has been recorded in four states: Oregon, Colorado, Massachusetts and Rhode Island. Washington State Veterinarian Amber Itle recommended dog owners be vigilant, as experts suspect the illness is more widespread than just the states it's been confirmed in. The illness causes pneumonia and does not respond to antibiotics, according to a news rele...