I have a 13year old cat. She just started having difficulty breathing(not panting). My vet gave her a cortisone shot that didn't help. He X-rayed her lungs and saw nothing (no fluid).
He gave me antibiotic to give her and 5mg of prednisone to give her. She does have allergies and gets a cortisone shot about every two months. She is also over weight. The breathing difficulty happened all of a sudden.
What else can be checked?
You can ask your vet if a sonogram will help with a diagnosis. vetcare