A two-year-old female spayed calico cat was presented to the Dentistry and Oral Surgery Services at Cornell University Hospital for Animals as a referral for dental disease. On general physical examination, the patient was apparently healthy, but the oral examination revealed extensive periodontal disease, missing teeth, gingivitis, enlarged mandibular lymph nodes and halitosis. Complete dental charting and intraoral radiographs indicated the need for full-mouth dental extraction. This report includes a discussion of periodontal disease, the importance of a systematic approach to diagnosing and staging periodontal disease and the technique used for surgical management of this case.