Thread: Heart Murmurs in Maine Coons

A grade one murmur is pretty slight, and could be just a result of your kitten being stressed at the vets, and a rapid heartrate. At 4 months some kittens do have a barely detectable murmur, which disappears by 6 months or so, up to a grade 3 I would not be unduly worried, *at this age*, however, it should be checked again in a month or two, and of course, keep an eye out for symptoms [unlikely] of tiredness after a little exertion, shortness of breath etc;