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Hi. Welcome to Just Answer. My name is***** I'm sorry to hear about this situation with Chicko. Coughing can be due to heart issues, tracheal issues or primary lung issues. With the fact that she's got the heart murmur and the enlarged heart, there is definitely the concern that the coughing is due to fluid building in the lungs from the heart not working as well as it should. This is a very serious situation when this arises and needs to be medically treated. The best thing to do would be to get her to your vet to have them do an exam on her and to take some chest x-rays to see what that shows. At home, you could try to get a couple videos of the coughing so they can see what you're seeing. Could this be due to a tracheal collapse - weakness in the cartilage there? That is possible and not as serious, but I wouldn't want to miss the more serious situation.