Hi Paula, I don't mean to worry you, but many of the behaviors you are speaking
of are not typical of a young Maltese. Perhaps you can get a second
or third Vet oppinion. Maybe another member from your area can recommend a
good Vet. I have also heard that heart murmors can be "not a problem". My
last dog had one and lived to be 15, and didn't die of a heart attack. So
keep the faith!
I would just get your Maltese checked by a couple more vets and be specific
about the strange behaviors and see what happens. Hopefully, you just have
an accentric Maltese in that he just is not as active as you would think,
but IS happy and healty. Unfortunately you need a GOOD vet to make that
assesment. Good Luck!