I am new to this forum and have my first Cavalier.

What I am noticing and most often repeated here are all the posts on dogs who are sick. That is really depressing and worrisome to consider. i had the Vet check Bentleys heart and she said it is good. He is also on Heartworm meds. Is there anything else to be done to avoid these Cavalier issues other than exercise and a good quality diet? I understand they are suseptible to heart issues as a breed.