I have a cat that is going in tomorrow morning for an echocardiogram. She is two and pants like a dog when she plays hard and sometimes just when she is excited. When I originally reported this symptom to the vet, she did an x-ray, which the radiologist said suggested mild cardiomegaly (heart enlargement). Further testing was suggested, so we are doing the echo tomorrow. However, for multiple reasons, I did just switch vets. We were in for an exam on Wednesday and discussed the upcoming echo and other causes for the panting. She mentioned the possibility of asthma. My gut says no. There is no coughing and no wheezing. She is an intense, hyper cat. If it's not heart, I'm honestly thinking it is just the adrenaline rush of stimulation. She seems desperate to play - and to play a lot. I wondered if anyone out there has had a cat with asthma and how it presents in cats. If the echo comes back okay, I would hate for her to assume asthma for lack of a better diagnosis. My son had asthma as a child so I know what it looks like in humans, but I'm assuming it could present differently in cats. Can anyone shed any light on this?