Thank you to all who have replied so far to my message. Pat you are an incredible wealth of knowledge, WOW! I am new to this. These are my first two Cavaliers and I have really been lucky so far with Polka, at 13 1/2 she is just showing signs of her age. But she still loves her walks. I have never had to deal with something like this before. The advice of dealing directly with the cardiologist was really great. I am going to work on that today. I do agree with everything. I do need to figure out the severity of colleens problem and treat it if that is what is recommended. I am not going to participate in the study. I just can't do that to her. Thank you all. I will keep you posted.