FILE – Owners bring their dogs to a park in Los Angeles on Wednesday, Aug. 31, 2022. Veterinary laboratories in several states, including Oregon, Colorado and New Hampshire, are investigating an unusual respiratory illness in dogs that causes lasting illness and doesn’t respond to antibiotics. The Oregon Department of Agriculture, which is working with state researchers and the U.S. Deparment of Agriculture’s National Veterinary Services Laboratory to find out what is causing the illnesses, has documented more than 200 cases of the disease since mid-August 2023. (AP Photo/Richard Vogel, File)

Veterinary laboratories in several states are investigating an unusual respiratory illness in dogs. Oregon, Colorado and New Hampshire are among the states that have seen cases of the illness. It does not respond to antibiotics. Symptoms include coughing, sneezing, nasal or eye discharge and lethargy. Veterinarians are encouraging pet owners to basic precautions like not having as much contact with other dogs and making sure the pets are up to date on their vaccinations. Labs across the country have been sharing their findings as they try to pinpoint the culprit.