my kitty (6 month) has abdominal breathing and sometimes he pants more than he should. everything is fine with him in regards to sleeping and eating and drinking. I took him to the vet and they did chest X-rays from two sides and blood test and everything was fine.he is fully vaccinated. he needed to get neutered, so I did cz the doctor said his lungs are clear so it's not related to heart or lungs. they told me his lungs are fine. what should I do? should I take him to a specialist? what kind of specialist? Thank you,