Malignant neoplasms of the oral cavity represent approximately 6% of all canine tumours; the incidence is lower in cats. A variety of neoplastic lesions occur, including both odontogenic and non-odontogenic tumour types. Non-neoplastic masses such as gingival hyperplasia and infectious conditions may be confused with oral tumours. Conversely, oral neoplasms may present as non-healing, ulcerated lesions instead of ‘typical’ prominent masses. Oral tumours frequently go unnoticed by the animal’s owner until the tumour reaches an advanced stage of development.
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