A 3-year-old female spayed Domestic Shorthair cat presented to the Cornell Dentistry and Oral Surgery Service for evaluation of chronic gingivitis. The patient was first noted to have generalized gingivitis at 4-5 months old, which progressed over the following three years. She had difficulty eating, halitosis, ptyalism, and frequently bleeding gingiva. On presentation, the patient was bright, alert, and responsive, with a generally unremarkable physical exam. Orofacial examination revealed mild mandibular lymphadenopathy, mild gingivitis associated with the maxillary incisors and canines, and severe gingivitis with mild gingival enlargement associated with all premolars and molars. A complete blood count revealed an inflammatory leukogram characterized by mild leukocytosis, mature neutrophilia, left shift, and monocytosis. Based on the patient’s young age and rapidly progressive, severe, generalized periodontitis, she was diagnosed with aggressive periodontitis. Fifteen dental extractions were performed, with a good prognosis for return of function and quality of life.