
What do you want to know? I've had 5 Cavaliers over the years. My Rufus, that I've often mentioned on here, went from no murmur at all to a grade 6 when he was 7 ½. The vet said it was so bad he would not live to Christmas that year. He lived until he was 15 years, 2 months and 2 days old. He was on medication all that time and had a great life. Yes the last few years he was doddery, various problems (the occasional fit, shook a lot, fell over now and then), but until his final day he was still happy. I always let him chose what he wanted to do. If he wanted a walk he got one. If he wanted to stay at home, he stayed at home. He went back to training classes aged 9 and passed his gold test. In many ways it was all far worse for us because we spent so many years expecting to find him dead one day. After about 6 years we started to believe he'd NEVER die. He ended up living longer than any dog I've ever had, of any breed, and after a few weeks without him, we got another cavalier, from the same breeder. If and when Monty's heart gets bad, I will take each day as it comes and not worry. I won't expect 15 years, but I won't expect just a few short months either. I know he's from longlived lines.
It's important to keep the weight down, the dog needs to be slim. I had another Cavalier who got just a grade 3 murmur when he was about 7. My mother in law had him living with her his last few years (long story) and she overfed him so much he was twice his ideal weight. He died aged 9 ½ despite having a much better heart than Rufus did. Rufus was always kept on the slim side.