The main danger is that if he gets overheated or to excited, his enlarged heart could choke off his airway. So, he's not going to be allowed to be as active as he would like to be. But with the right environment and treatment, he can live a normal life, and that's good to hear.
She got spayed a week ago, and her recovery is going well. It's hard to believe that any animal could recover so quickly from major surgery like that. In fact, she was looking so good that I took the cone of shame off a day early, and she has been smiling ever since.
Today she has been running around at full speed. And her incision has healed so well that it's hard to tell she even has one.