Episodic Falling Syndrome (EFS)

Episodic = Relating to an episode

Episodic Falling SyndromeThis condition is triggered after exercising or excitement. This syndrome is a genetic disorder found only in Cavalier King Charles Spaniels. The condition appears to be life-long, but not life-threatening.


  • Resembles a seizure, but is not classified as one
  • No loss of consciousness
  • Muscles unable to relax
  • Lose balance, footing, or coordination
  • Rigid gate
  • Hopping around like a rabbit
  • Rear legs stiffen or may hold front legs sill over the head
  • Jaw clenches shut


  • Exercise
  • Excitement
  • Stress
  • Heat
For more information visit the Cavalier Episodic Falling Syndrome website: