I have known from early on my cavalier has an enlarged heart (since birth).He was diagnosed with a heart murmur over 2years ago, now it has become a grade 2/3, he's on medication twice a day for the murmur from it was detected.. He has had alot of health problems all his life (9, on August 4th this year). He has really slowed up.. going up stairs is more difficult as is getting up on chairs and he can't always run after the cats like he use to.. He doesnt want going for walks unless on a beach. Even with all he's been through in his life he's still as loving and cuddly as ever.