You have done the right thing, having him checked regularly by the vet. On this forum we are not vets and cannot give medical opinions. However, you mention that the vet said that your dog does have a slight heart murmur. My beloved Puce, who passed in 2011, had a heart murmur which got gradually worse, despite tablets from the vet. Her main symptom was coughing. At first it was only very occasionally (say once every few days) but a few years it later became a real problem.
Heart murmurs are caused by blood flowing the wrong way down one or more valves. You can read about it here:
https://www.petmd.com/dog/conditions...g_heart_murmur
The article is written by a vet.
I suggest that you keep your dog's condition monitored carefully by the vet. Later on, if the condition worsens, your vet can give you tablets to help control the problem (although, sadly, it cannot be cured except by a very major operation).
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