Greyhound Seizures: Etiologies and Approach

Seizures in Greyhounds have breed-specific considerations:

Common Causes

1. Idiopathic epilepsy: Most common (onset 1–5 yr); presumed genetic; no structural/metabolic cause found.
2. Traumatic brain injury: Racing/retirement accidents; high-speed collisions.
3. Neoplasia: Brain tumors (glioma, meningioma) >5 yr; also metastatic (hemangiosarcoma).
4. Metabolic: Hypoglycemia (insulinoma), hepatic encephalopathy (portosystemic shunt), renal/uuremic, electrolyte.
5. Toxins: Lead (old paint), organophosphates, metaldehyde, xylitol, medications.
6. Infectious: Distemper, rabies, neosporosis, toxoplasmosis, fungal (cryptococcus), tick-borne (Ehrlichia, RMSF).
7. Vascular: Infarct, hemorrhage (hypertension, coagulopathy).

Greyhound-Specific

• Higher RBC count, lower platelets, lower T4 (normal for breed) – interpret labs cautiously.
• Anesthesia sensitivity (low body fat, CYP metabolism).
• Osteosarcoma risk (may metastasize to brain).

Workup

1. History, neuro exam, CBC/chem/UA/T4, bile acids, infectious titers.
2. MRI + CSF analysis (gold standard for structural/inflammatory).
3. EEG rarely used in vet med.

Treatment

• Phenobarbital, levetiracetam, zonisamide, potassium bromide.
• Monitor levels, liver, CBC.
• Treat underlying cause if identified.