Hello,
I can try, heart murmers can go quite in depth.
It is a breed trait of cavaliers, there are not many of them unfortunately now who don't develop a hearth murmur sooner or later.
Heart murmers in cavies is usually mitral valve disease. The heart is made up of 4 chambers separated by valves, sometimes the valves don't close off properly allowing a seepage backwards. This can be heard as a faint 'woosh' sound when listened to with a stethoscope. There are different types of heart murmurs so I cannot dicuss indepth anyone, your vet or a referral vet if required should be able to tell you.
There are varying degrees of heart murmurs, ranging from grade 1 mild to grade 6 with can be heard without the use of a stethoscope.
Dogs with heart murmurs can go on to lead long and happy lives depending on the progression of the disease. As the dog gets older you may notice a lack of tolerance to exercise, if your dog is required to go under a general anaesthetic or sedation there is a slightly higher risk and the nurse/vet needs to be aware that your dog has a murmur. She may need heart tablets as he gets older to prevent fluid build up on her chest.
Her health is compromised, but bearing this in mind you can make changes in hyour dogs life to help. She must not become overweight! this will put a massive strain on her heart, low sodium diets, and no extreme exercise. Regular walks are essential how ever to keep her fitness up.
If you have any further question please ask and I will do my best to answer them. Make a point of asking your vet however. They should explain things to you