Some breeds of animals are known to be at higher risk of heart disease. If you are intending to breed your animal, and it is a breed for which cardiac disease is known or suspected to be inherited, you should have your animal screened for heart problems prior to breeding.
Some common breeds at risk are: Maine coon cats, Ragdoll cats, Cavalier King Charles spaniels, Doberman pinschers and boxer dogs. Other breeds can also be at higher risk.
Genetic testing is available for some cardiac diseases. Where testing negative for the genes that are known to result in heart disease does not guarantee a healthy heart, it's a great addition to your screening regimen prior to breeding.