When I took , our semi-feral Baby to get spayed to day. the vet told me he'd had a colleague, look at my little dog Sophies, tests for her heart, he said it was worse than he thought. I told him she's doing really well, happy, playing with the kittens, he said it is only a matter of time, He renewed her prescriptions, he said even the stress of a vet visit, could trigger a massive heart attack. He also told me most dogs, with congestive heart disese. die with in a few weeks to a few months. I didn't want to hear that.