Cable's been wheezing lately, so i took her to the vet a couple of weeks ago. vet thought it was feline asthma - gave her a steroid shot - & i had recently switched to a new, lighter-weight litter that i thought might have triggered it [she's a major flinger!]. anyway, it got a little better w/the litter switch, but then came back, so we went back. vet said wheezing in lungs sound was better, & now she could hear a heart murmur, so they did x-rays. x-rays confirmed some fluid in lungs - she's now on Lasix for that - & vet was sure that the fluid was due to feline cardiomyopathy. Cable's only 7, & healthy otherwise, so the vet thinks that meds [enalapril - i take it, too!] will suffice & that she should live many more years. we're trying out the meds for a month, then a recheck to see if things have improved.