Within the past month, two of my cats have passed away from this, and now my dog has an enlarged liver and a small amount of fluid in his lungs, which I'm hoping will be treatable, but I have to wait for test results from our vet. I've contacted the environmental department of my county, and according to them, no lab will test for everything; they'll only test for specific things. The head of the department is going to come and look around our house, because he thinks this sounds like radon poisoning (I'm from the town that IBM was founded/located, this is common due to previous toxic spills.) Any other ideas on what could cause this?