Canine systolic heart murmurs demonstrating murmur intensities

Good quality headphones or loudspeakers (capable to transmit all frequency components) are necessary to hear the sounds at best quality.


Grading, mp3-files and description of the intensity of the murmur:

  • 0/6: Physiological (mp3) No murmur.
  • 1/6: Mild mitral insufficiency (mp3) Very soft, localized murmur detected in a quiet room after intently listening for a few minutes.
  • 2/6: Mild mitral insufficiency (mp3) Soft murmur but easily heard after a few seconds.
  • 3/6: Mild mitral insufficiency (mp3) Moderate-intensity murmur.
  • 4/6: Moderate mitral insufficiency (mp3) Loud murmur but not accompanied by a palpable thrill (vibration).
  • 5/6: Severe mitral insufficiency (mp3) Very loud murmur accompanied by a palpable thrill.
  • 6/6: Severe pulmonic stenoses (mp3) Loudest murmur that produces a palpable thrill still audible after stethoscope is removed from the chest.


Based on: Ettinger, S.J.-Feldmann E.C. (2010): Textbook of veterinary internal medicine. Diseases of the dog and cat, 7th ed., Saunders Elsevier , St. Luis. This grading system was adopted from the human cardiology, first described by Levine and Freeman in 1933