This retrospective study was conducted using data from the University of Florida and University of California-Davis databases between 20. The purpose of this study was to report outcome in a cohort of dogs with histologically confirmed small adrenal tumours without vascular invasion treated with adrenalectomy. Veterinary studies have reported the outcome of adrenalectomies in dogs however, these studies typically include a wide variety of adrenal tumour sizes, including cases with or without vascular invasion.