A Rare Variant of Multicentric Large B-cell Lymphoma with Plasmacytoid and Mott Cell Differentiation in a Dog

SummaryThis report details the diagnosis and immunohistochemical characterisation of a disseminated B-cell lymphoma with a predominant Mott cell phenotype in a 5-year-old, neutered male Australian shepherd dog. The dog presented with progressive neurological signs as a result of cerebrocortical involvement.