I purchased my pomerianian in May and he still has a cough which the vet is not sure why. They have done ex-rays and it doesnt show up that he has a problem with his trac. Have you known of any problems like this? Please help me if possible

Hi.
My Jack Russell and my sisters Pomeranian both had partially collapsed tracheas. The Pom was much worse, she coughed a lot, my dog didn't. I think there is an op which opens the rings in the trachea, but not sure of how successful it is. Good luck.
Dawn.