why is my dog breathing heavy while resting

A dog breathing heavily while resting may indicate a range of underlying causes, some of which can be serious medical conditions. Common reasons include heart problems like congestive heart failure causing fluid buildup in the lungs, respiratory infections such as pneumonia or bronchitis, pain from various causes, heatstroke, or anxiety. Certain breeds with shorter snouts may also naturally breathe heavier. Heavy breathing at rest—defined as over 40 breaths per minute—should be closely monitored and warrants a veterinary evaluation to rule out serious conditions such as heart failure, lung disease, or respiratory distress. Signs like pale or blue gums, coughing, restlessness, or labored breathing increase the urgency to seek immediate veterinary care.