A dog being treated for demodicosis with ivermectin was presented for intermittent vomiting. The vomiting progressed to hematemesis and an underlying coagulopathy was diagnosed. The etiology of the coagulopathy was determined to be ingested brodifacoum. Ultrasound evaluation of the abdomen revealed thickened gastric wall that was suspected to be intramural hemorrhage. Most likely, the intramural hemorrhage and resulting thickening of the stomach wall led to the clinical signs and metabolic alkalosis. This case represents an typical presentation of hemorrhage secondary to rodenticide intoxication. (J Vet Emerg Crit Care 2001; 11(1):27–31, 2001).