Dog 'Fly Catching' Syndrome: Why Biting at Invisible Bugs Is a Neurological Focal Seizure — Not a Quirk — Complete 2026 Vet Guide
Fly-catching syndrome (FCS) — a dog repeatedly snapping at the air as if biting invisible insects — is one of the most misunderstood neurological signs in veterinary medicine. Most owners dismiss it as a cute quirk for months or years. But Cornell University, VCA Animal Hospitals, MSPCA-Angell Neurology, and a 24-dog multicenter study (Epilepsy & Behavior 2015) all confirm: this behavior can be a focal seizure originating from the visual cortex or temporal lobe, a GI-driven compulsive disorder, or OCD — but all three require veterinary diagnosis. Breeds at highest risk: Cavalier King Charles Spaniels, Miniature Schnauzers, Greater Swiss Mountain Dogs, German Shepherds, Bull Terriers. This guide covers the complete diagnostic framework, treatment options (phenobarbital, levetiracetam, fluoxetine), the GI disease connection, and when fly-catching becomes a seizure emergency.