Changes

Predisposed breeds of dog include the Miniature Schnauzer, Cocker Spaniel, Fox Terrier, Chihuahua, Miniature Pinscher, Labrador Retriever, Newfoundland, Mastiff, Boxer, Samoyed and English and French Bulldog.

Predisposed breeds of dog include the Miniature Schnauzer, Cocker Spaniel, Fox Terrier, Chihuahua, Miniature Pinscher, Labrador Retriever, Newfoundland, Mastiff, Boxer, Samoyed and English and French Bulldog.

== Clinical Signs ==

== History and Clinical Signs ==

Exercise intolerance, syncope and signs of [[Heart Failure, Right-Sided|right sided congestive heart failure]] (if severely affected). Sometimes the condition can be asymptomatic if only mildly affected.  

Clinical signs include exercise intolerance, syncope and signs of [[Heart Failure, Right-Sided|right sided congestive heart failure]] (if severely affected). Animals may be asymptomatic.

== Diagnosis ==

== Diagnosis ==