No this is not normal and something that you need to have checked out, heartworms for one causes a symptom of heavy breathing and this can cause congestive heart failure if not treated accordingly. It can also be a sign of respiratory distress so I would recommend that you have him seen by your veterinarian as soon as possible. If he has always done this and now it has increased you need to determine the underlying illness behind it as increased symptoms is a sign of a worsening of the condition.
*Cheryl K* Please click the
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