This is one of several forms of heart muscle disease which commonly affects cats. Although the condition is rare in dogs, the German Shepherd Dog is cited as being the breed most likely to be afflicted with this disease. The cause is unknown.
Characterised by the gross thickening of the muscle in the walls of the heart which makes the walls stiff and less compliant, resulting in poor filling of the heart chambers with blood during the diastolic phase of contraction, and inadequate output of blood during systole. The clinical signs of this condition are those of heart failure.
Note: This section of the Canada's Guide to Dogs website is intended as a source of information only. It is not intended as a substitute for professional care. Always consult with your Veterinarian about health related matters.