08-25-2010, 01:33 AM
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I know that while cantering, the horse inhales and exhales in time with the gait; breathing in as they lift up, out as the come back down. It seems reasonable for a horse to do something similar in the trot.
Since your horse has that murmur, I wouldn't just wave it off. If his breathing is regular, that's a good sign, and if it comes back down to his resting rate in a normal amount of time, that's also a good thing. Regardless, I would still call a vet and ask. The heart isn't something to mess around with.