The websites of the following Breed Clubs discuss or explain heart testing in their breeds.

• The Boxer Breed Council www.boxerbreedcouncil.co.uk for information on aortic stenosis and dilated cardiomyopathy
• Cavalier Club on www.thecavalierclub.co.uk (click on "Cavilier Health" and then "Hearts" on left navigation panel)
• Feline Advisory Bureau on www.fabcats.org
• Newfoundland Club on www.thenewfoundlandclub.co.uk