I have to agree with shawn when I first got into retics I thought my first retic had an r.i. But he didnt have any signs of it other then the breathing heavly. I took him to the vet and the they told me he was fine. Sometimes mine breath heavy when they get ill with me. If I have to clean a cage and they dont really want to be messed with they start breathing really hard and huffing and puffing to let me know there not to happy