Nineteen dogs were identified that had mastocytemia (mast cells in venous blood samples) not associated with mast cell neoplasia. The first 10 dogs were identified by examination of blood films from dogs with suspected parvovirus enteritis (8), fibrinous pericarditis and pleuritis secondary to thoracic lacerations (1), and renal insufficiency of unknown cause (1). Because of the apparent association with acute enteritis, blood films from 52 suspected canine parvovirus cases were examined retrospectively and 8 mastocytemic dogs were found. An additional 52 canine blood films were randomly selected from the same retrospective time period and 1 mastocytemic dog was found that had pneumothorax, pelvic fractures, and hemorrhagic septic abdominal effusion secondary to renal hemorrhage and traumatized intestines. All mastocytemic dogs had acute inflammatory leukograms the day that mast cells were first detected: neutropenia with toxic neutrophils (4), neutropenia with a left shift (8), total neutrophil count within reference interval but with a left shift (5), or neutrophilia with a left shift (2). All dogs except the renal insufficiency case had circulating toxic neutrophils. Five dogs were mastocytemic on more than 1 day. The pathogenesis of the mastocytemia associated with the acute inflammatory disease was not determined.
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