My Sydney has had a heart murmur all his life. He is 16 years old now, still going strong. I don't know anything about this Grade 3 or 4.. I've never been told anything about a grade of Sydney's murmur. He has never had any special medication or treatment for it. Maybe his is a real mild level of one. I don't know anything more about heart murmurs in cats in general.
Perhaps your friend might want to take Henry to another vet for a second opinion, before putting him through all these tests?
I meant," said Ipslore bitterly, "what is there in this world that truly makes living worthwhile?"
Death thought about it.
CATS, he said eventually. CATS ARE NICE.
-- Terry Pratchett (1948—2015), Sourcery
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