강아지 혀·입술 병변 자주 묻는 질문 Q&A — 보호자가 꼭 알아야 할 핵심

Dog Tongue and Lip Lesions FAQ — Key Information Every Pet Owner Should Know

Oral HealthQ&AMeongsiljang Veterinary Advisory Board

Lesions on a dog’s tongue and lips may be simple inflammation, but they can also signal malignant tumors or immune-mediated diseases. Here’s a summary of the key information every pet owner should know.

What Are the Common Causes of Lesions on a Dog’s Tongue and Lips?

A close-up shot showing lesions on a puppy’s tongue and lips.

Lesions on a dog’s tongue and lips can stem from a variety of causes, including periodontal disease, autoimmune reactions, trauma, infections, and tumors. Inflammation around the teeth or autoimmune stomatitis are particularly common culprits, while bacterial infections or physical injury can also lead to lesions. Although some tumors are benign, any lesion that persists or grows warrants a thorough examination by a veterinarian. If you suspect a lesion, it’s important to have it checked early to identify the underlying cause.

Summary of the Main Causes of Lesions

There are many possible causes of lesions on a dog’s tongue and lips. Here are the key causes that pet owners should be aware of. Periodontal disease: Inflammation around the teeth can spread throughout the oral cavity, leading to ulcers or other lesions. Autoimmune disorders: The immune system may mistakenly attack the body’s own tissues, resulting in oral ulcers. Trauma: Repeated injuries from food, water, or chewing can cause lesions. Infections: Certain bacterial or fungal infections can lead to lesions, so extra caution is needed when the immune system is compromised. Tumors: Both benign and malignant tumors can develop in the mouth. Because treatment strategies for tumors depend on their size and nature, early veterinary examination is essential.

An illustration explaining the main causes of oral lesions in dogs

When Should You Visit the Vet?

If you suspect your dog has lesions on its tongue or lips, visit the vet immediately if you notice any of the following symptoms:

Severe bad breath: Persistent foul odor may indicate infection or ulcers.

Refusal to eat: Pain in the mouth can cause reluctance to eat or difficulty swallowing.

Increased drooling: Mouth pain often leads to excessive salivation.

Frequent mouth opening or shaking: Dogs may frequently open or shake their mouths due to discomfort.

Blood-tinged saliva: Deeper lesions can cause bleeding.

Weight loss: Reduced food intake can easily lead to weight loss.

An image showing a dog exhibiting signs of mouth pain

Cases Requiring Immediate Veterinary Attention

If the lesion persists, grows larger, or if your dog refuses to eat or drink or shows signs of pain, immediate veterinary attention is necessary. In particular, if the lesion does not heal well and lasts for a long time, or if it grows rapidly, there may be a possibility of a tumor or chronic inflammatory disease, so a veterinarian must make an accurate diagnosis through a biopsy or X-ray. A biopsy may be performed under anesthesia and is the most reliable method for determining the nature of the lesion. Delaying treatment can make recovery more difficult.

Comparison of Management Strategies Based on Lesion Severity

Item	Mild	Moderate	Severe
Symptoms	Small red spots or mild inflammation	Ulcers, bleeding, difficulty eating	Persistent pain, high fever, rapid weight loss, severe bleeding
Possible Causes	Periodontitis, trauma, early infection	Autoimmune disease, spread of inflammation around teeth	Benign/malignant tumors, chronic inflammation, possible metastasis
Management Method	Oral rinsing, antibacterial treatment, detailed examination	Tissue biopsy, immunosuppressants, anti-inflammatory therapy	Surgery, radiation therapy, chemotherapy, lesion removal and treatment

If symptoms worsen or persist, seek specialized veterinary care early.

What Tests Are Needed for an Accurate Diagnosis?

To accurately diagnose lesions on a dog’s tongue or lips, several tests are typically required. First, the veterinarian will directly examine the inside of the mouth, and if necessary, perform a more detailed examination under anesthesia. Key diagnostic tools include tissue biopsies, blood tests, X-rays, and MRI scans. A biopsy is the most reliable method for determining the nature of the lesion. Blood tests help identify any underlying systemic conditions, while X-rays are used to assess the location and extent of tumor involvement. The specific tests recommended will vary depending on the veterinarian’s assessment, so it’s important to discuss and follow their guidance to ensure an accurate diagnosis.

An image of a veterinarian performing a biopsy on a dog’s oral lesion under anesthesia.

How Does Treatment Vary?

Treatment depends on the underlying cause and severity of the lesion. If periodontal disease is the culprit, dental cleaning and antibiotic therapy are the mainstays. In cases of severe infection, topical antibiotic application or oral medication may be necessary. For autoimmune conditions, immunosuppressants are prescribed, while tumors may require a combination of surgery, radiation, and/or chemotherapy. If the lesion is small and benign, surgical removal followed by a recovery period is typically sufficient. Throughout treatment, it is crucial for pet owners to monitor their pet’s condition regularly and strictly follow the veterinarian’s instructions.

Precautions During Treatment

During treatment, be careful to prevent your dog from licking or scratching its mouth. Constant licking can introduce oral bacteria to the lesions, leading to secondary infections, worsening the condition, and delaying recovery. Do not miss any doses or adjust the dosage on your own; administer the medication exactly as directed by your veterinarian. Offer soft, warm food and frequently refresh the water supply. Additionally, create a low-stress environment for your dog throughout the treatment period.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

My dog has white spots on its tongue. Is this a cause for concern?

White spots may indicate a candida infection, an ulcer, or the early stages of a tumor. If they persist or grow, a veterinary visit is necessary.

Can oral lesions be prevented?

Regular dental care, feeding a healthy diet, and routine veterinary check-ups can help reduce the risk of developing lesions.

My pet’s mouth hurts more after taking the medication. What should I do?

This could be a side effect of the medication, so please inform your veterinarian right away. Do not stop giving the medication or adjust the dosage on your own.

The lesion seemed to disappear, but it has come back. Why is that happening?

Relapse may occur if the underlying cause wasn’t fully resolved, if the pet’s response to medication has diminished, or if an immune-mediated condition has flared up. A follow-up examination is necessary.

Are small-breed dogs more prone to developing lesions?

Small breeds can also develop oral lesions. While size alone doesn’t determine the likelihood of occurrence, certain purebred dogs are more frequently reported to suffer from oral conditions like chronic stomatitis. That’s why regular dental check-ups are important for all dogs, regardless of breed.

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References

[1] Ribka, E.P. & Niemiec, B.A. (2023). Clinical Medicine of the Dog and Cat, 4th Ed. Elsevier.

[2] Plumb's Veterinary Drug Handbook, 9th Ed. (2022). Wiley-Blackwell.

[3] American Veterinary Dental College. (2021). Guidelines for Diagnosis and Management of Canine Oral Lesions.