Corazon has a significant heart murmur but we are unable to do diagnostics to determine the cause. Cats can have loud heart murmurs that are inconsequential or have soft heart murmurs that are serious, so we aren't sure how serious his heart murmur may be. In general, however, loud murmurs like his are serious. Ideally he would get an ultrasound of his heart done. He is very sweet and is doing quite well right now. If possible, we highly recommend he have his heart murmur followed up on.