A cat may show little or no symptoms. The first symptom may be sudden death. The following symptoms are possible:

  • shortness of breath
  • accelerated breathing
  • inertia
  • sub-temperature
  • irregular, weak or unfeeling groin pulse
  • paralysis of the hind legs
  • loss of appetite / not wanting to eat
  • vomiting
  • slimming
  • heart murmur

It should be noted that not every heart murmur is a sign of HCM, and in all cases of HCM, a heart murmur cannot be heard through a stethoscope.

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