I have a puppy who has a heart problem. We knew she had a heart murmur when we got her but I'm beginning to worry a lot more. The breeder is a neo natal nurse and said she had a valve that wasn't closed that would hopefully close soon or require surgery. She said it was common and what not and gave her to us. Now I'm beginning to wonder if maybe the breeder is wrong because she isn't as playful as the other puppy. She has a vet appointment next week. Has anyone ever dealt with this or have any tips?