Common Lumps in a Dog's Mouth: Causes and Treatments

Just like humans, dogs can develop lumps and bumps as they get older, including inside their mouths. This article covers 7 common types of oral lumps in dogs, ranging from harmless growths to malignant tumors, so you can recognize warning signs and know when to seek veterinary care.

Non-Cancerous Oral Growths in Dogs

Not all lumps found inside your dog's mouth are cancerous. Some are benign but should still be watched closely and checked by a veterinarian to ensure they don’t cause problems or become malignant over time.

Epulis (Gum Nodules)

Epulis, often known as gum nodules, represent the most frequent benign oral growths in dogs. These lumps typically match the color of the gums and tend to have a smooth texture. You'll often find them between the teeth, especially near the canine or incisor teeth. They can be either rounded or stalk-like (pedunculated).

Dogs older than six years are more prone to these growths, and they are particularly common in brachycephalic breeds such as pugs, boxers, and bulldogs. As these lesions expand, they might make eating uncomfortable, cause drooling, bad breath, occasional bleeding, and may even lead to teeth misalignment.

If you spot a lump like this in your dog's mouth, it's important to get a prompt evaluation by your veterinarian. Surgical removal is usually advised if the lump grows large enough to cause discomfort or interfere with normal mouth function.

Viral Papillomas (Oral Warts)

These contagious lumps are caused by a canine papillomavirus and are usually passed between dogs by direct mouth-to-mouth contact. They most commonly occur in puppies and young dogs under two years old before their immune systems fully mature.

Viral papillomas often look like clusters of cauliflower-like growths but might also appear smooth. The good news is that in most cases, they disappear naturally within six months as the dog's immune system fights off the virus. However, they still require monitoring with veterinary guidance as a small percentage could become malignant.

Malignant and Possibly Malignant Oral Tumors

Oral cancers in dogs mainly include three types: melanomas, squamous cell carcinomas, and fibrosarcomas. These require urgent medical assessment and treatment.

Oral Melanomas

Malignant melanomas are the most frequently diagnosed oral cancers in dogs. These tumors originate from pigment-producing cells called melanocytes. They can develop on the lips, gums, soft palate, or tongue. Older dogs are more susceptible, and breeds with pigmented oral mucosa like the Chow Chow have a higher risk.

Symptoms often include difficulty chewing or swallowing, bad breath, swelling around the face, and bleeding in the mouth. Oral melanomas are aggressive cancers that tend to spread quickly to lymph nodes and lungs.

Squamous Cell Carcinomas

While these cancers more commonly occur in cats, they do sometimes affect dogs. They develop primarily on the gums and act aggressively locally. Affected dogs might exhibit bad breath, pain, drooling, and reluctance to eat. Early diagnosis and surgical excision usually improve the prognosis.

Fibrosarcomas

Fibrosarcomas manifest as reddish lumps or ulcers on the fibrous tissues inside the mouth. These tumors often ulcerate, bleed, and grow slowly but invade surrounding tissues. If identified early, treatment may have better chances of success.

Other much rarer oral cancers include mast cell tumors, lymphomas, and osteosarcomas. Due to their complexity, these often require specialized oncologic care.

When Should You Take Your Dog to a Veterinarian?

Any new lumps, swelling, unexplained bleeding, foul odor from the mouth, difficulty eating, or notable changes in your dog's oral area should prompt a veterinary examination. Early evaluation dramatically increases chances for effective treatment and helps maintain your dog's quality of life.

Your veterinary professional may conduct a comprehensive oral inspection, perform dental radiographs, and may take biopsies of suspicious lumps to accurately diagnose their nature. Treatments range from simple surgical removal for benign or localized lumps to advanced cancer therapies if malignancy is confirmed.

Keeping an eye on your dog's oral health is essential in preventing serious consequences and ensuring your furry friend's well-being.