If the MVD is only grade 1 or 2, then I doubt the panting and lack of energy are due to MVD.
Fortekor is an ACE-inhibitor, and the official consensus statement of board certified cardiologists in the US -- the ACVIM Consensus Statement -- does not recommend giving any cavalier any drugs, ACE-inhibitor or otherwise, if all the dog has is a mild murmur, like a grade 1 or 2, unless the dog's heart is clearly enlarged.
I am wondering if your vet knows what she is doing. I suggest that you print out the ACVIM Consensus Statement and give her a copy of it and let her decide if she still thinks prescribing Fortekor is appropriate. The link is here:
http://cavalierhealth.org/images/acv...ccvhd_2009.pdf
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