Well my newest rescue, 9 month old Jack Frost (formerly known as Oliver), had his first vet visit today, and was diagnosed with a grade 3 heart murmur. A cardiology specialist was recommended and when funds allow, he'll have his ultrasound. In the mean time he seems fine. Eating well ect..but gets winded with any vigorous play. Anyone with experience with this type of problem? Trying not to panic here.