Thread: Heart Murmurs in Maine Coons

I don't have any experience of heart murmurs, though Grade 1 is the least severe of the condition. Here is a link which may give you more information, though not specific to MCs. I have been told that they can improve as the kitten grows, and even the more severe murmurs don't necessarily cause major problems for the cat. There is a lot of information on the net, so a bit of surfing would give you more information, then you can speak to your vet if you have any queries.

10 Causes of Feline Heart Murmur - VetInfo