What should you know about dog oral squamous cell carcinoma?

Squamous cells line parts of the mouth, and abnormal growth in these cells can form a sore, lump, ulcer, or thickened area. Possible signs include bad breath that persists, bleeding, drooling, difficulty chewing or swallowing, loose teeth, facial swelling, or a change in the way the jaw moves. These signs have other possible causes, so they do not establish cancer by themselves. Examination and a tissue sample may be needed to identify the condition and guide treatment.

Book an assessment promptly for a mouth lesion that does not heal, keeps bleeding, or changes in size. The clinician may inspect the mouth, feel nearby tissues, check lymph nodes, and arrange imaging or biopsy. Treatment can involve removal of the growth, with the exact approach depending on its position, depth, and whether nearby structures are involved. Information on [Skin Cancer Surgery](/treatments/surgical-dermatology/skin-cancer-surgery/) and [Surgical Excision](/treatments/surgical-dermatology/excisional-surgery/) can help you understand procedure terms.

Seek urgent care if there is trouble breathing, inability to swallow water, uncontrolled bleeding, severe weakness, rapidly increasing facial swelling, or signs of dehydration. Arrange rapid review for persistent mouth bleeding, a foul smell with a visible lesion, or refusal to eat. Do not wait for pain: oral cancers can cause noticeable tissue changes before discomfort becomes prominent.

Ask where the lesion is located, whether a biopsy is recommended, what the sample can show, whether imaging is needed, which treatments are realistic, how eating will be supported, and what changes should trigger immediate contact.