Spontaneous hemoperitoneum and anaphylactic shock associated with Hymenoptera envenomation in a dog.

Abstract: Objective: To describe the clinical presentation of a dog with spontaneous hemoperitoneum associated with anaphylactic shock from Hymenoptera envenomation. Case Summary: An 8‐year‐old female neutered Beagle presented as an emergency for acute onset of collapse, hematemesis, and hematochezia. The dog was tachycardic, tachypneic, and hypotensive. Initial assessment revealed a hemoperitoneum with documentation of a nonclotting sanguineous peritoneal effusion with PCV 81% and total protein concentration 65 g/L (6.5 g/dL). No obvious masses were appreciated ultrasonographically during original presentation and cytology of the peritoneal effusion was unremarkable. Peripheral PCV was 67% and total plasma protein concentration was 72 g/L (7.2 g/dL). A bee stinger was located in the right upper lip after presentation and was postulated to be the inciting trigger for the abdominal hemorrhage and shock. The patient was medically stabilized and ultimately made an uneventful recovery. Abdominal ultrasound performed 3 days after discharge revealed a single 0.85 cm hyperechoic liver nodule. Follow‐up evaluation at 6 and 18 months after presentation documented a normal physical examination, unremarkable thoracic radiographs, and no change in the original hyperechoic liver nodule. New or Unique Information Provided: This report details an unusual clinical presentation of anaphylactic shock due to Hymenoptera envenomation in a dog. To the authors’ knowledge, spontaneous hemoperitoneum associated with anaphylaxis and bee envenomation has not been documented in the veterinary literature. [ABSTRACT FROM AUTHOR]