Exercise intolerance in dogs is often a cardiac sign requiring investigation, and appropriate exercise management is critical for dogs with heart disease.
Exercise intolerance as a cardiac symptom is often missed because owners attribute it to aging or weight rather than recognizing it as a disease signal. Dogs with significant cardiac disease experiencing breathlessness during normal activities are suffering welfare harm from reduced oxygen delivery and the distress of respiratory compromise. Appropriate exercise management for cardiac dogs is individualized and dynamic - it changes as disease progresses. The goal is maintaining the positive welfare benefits of appropriate exercise (physical fitness, mental stimulation, social interaction with owner) while avoiding exertion that stresses a compromised heart. Dogs in early heart failure often do best with multiple short, gentle walks rather than single long exercise sessions.