This information is provided by Provet for educational purposes only.
You should seek the advice of your veterinarian if your pet is ill as only he or she can correctly advise on the diagnosis and recommend the treatment that is most appropriate for your pet.
If the valve becomes damaged - such as occurs with chronic valvular degeneration (or endocardiosis) the blood leaks back (called regurgitation) into the atrium and causes an abnormal heart sound (murmur) which can be heard loudest over the 4th intercostal space on the right hand side of the chest wall. On X-rays the affected atrium and ventricle may appear enlarged.
Last updated : October 2013