Haemoabdomen due to suspected anaphylaxis in four dogs

Haemoabdomen was diagnosed in four canine patients treated for suspected anaphylaxis. The diagnosis of anaphylaxis was based on a peracute history, compatible clinical signs, good response to supportive treatment and exclusion of other causes. The haemorrhagic peritoneal effusions occurred in the absence of an initiating coagulopathic disorder and without an alternative explanation for abdominal haemorrhage. In all patients, the haemoabdomen resolved with medical management alone. Anaphylaxis should be considered a potential differential diagnosis for spontaneous haemoabdomen in dogs.