This report describes three dogs with intracranial haemorrhage secondary to severe coagulation defects associated with Angiostrongylus vasorum infection. The initial case was diagnosed at necropsy, with two subsequent cases diagnosed antemortem and successfully treated. The dogs ranged in age from 14 months to four years and were presented for evaluation of a severe, subacute onset of suspected cerebral disease. Magnetic resonance imaging performed on all three dogs was suggestive of multiple areas of intraparenchymal brain haemorrhage. Coagulation assays showed a consumptive coagulopathy resembling chronic disseminated intravascular coagulation. Postmortem examination of the initial case confirmed the presence of multiple intracranial and extracranial haemorrhages. An unexpected finding was that of a marked multifocal nematode infection of the lungs with an associated vasculopathy. The parasites were confirmed to be A vasorum. In the two other dogs, faecal examination by Baermann technique confirmed A vasorum infection. Both dogs were treated with fenbendazole and one was additionally given a plasma transfusion. Repeated coagulation assays were normal within one week. Neurological examinations were normal for both dogs within six weeks. This case series indicates that A vasorum infection should be considered as a possible aetiology of intracranial haemorrhage in dogs.