Canine ear cancer is a serious health issue that affects many dogs. According to research, ear cancer is the second most common type of skin cancer in dogs.
Some breeds are more prone to ear cancer, such as Cocker Spaniels and Basset Hounds. These breeds have a higher risk due to their ear anatomy.
Early detection is key to successful treatment and recovery. Symptoms of ear cancer include a mass or lump in the ear, discharge, and bleeding.
The American Kennel Club recommends regular ear checks to catch ear cancer early.
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Causes and Risk Factors
Ear cancer in dogs is a serious issue, and understanding its causes and risk factors can help you take preventative measures.
Recurrent and long-term inflammation of the ear canal can lead to abnormal growth of tissue and eventually to the formation of a tumor. This is often the result of chronic ear infections or repeated infestations of ear mites.
Certain dog breeds are more prone to ear cancer due to their ear anatomy. Dogs with compressed ear canals, such as Pugs, and those with long or heavy drooping ears, like Cocker Spaniels, are more susceptible to bacterial and yeast infections, which can lead to inflammation and thickening of tissues.
Ear mites, which are parasites, can cause irritation and inflammation, and repeated infestations can lead to the overgrowth of tissues and possible transformation to cancerous growths.
Many ear tumors are polyp-like growths that arise and attach to the structures lining or making up the ear canal. Malignant tumors are more commonly seen than benign ones, and they tend to appear in middle-aged or older dogs.
Here are some risk factors for ear tumors in dogs:
- Dogs with large, floppy ears (Cocker Spaniels, Beagles, Golden Retrievers)
- History of multiple ear infections (otitis externa, otitis interna, otitis media)
- Long-term inflammation of the ear canal
- Repeated infestations of ear mites
- Thickening of the ear wax for any reason (usually unknown)
Benign tumors usually grow locally and compress tissues, but they usually do not spread to other areas. Malignant tumors, on the other hand, are locally aggressive and have the potential to metastasize to nearby lymph nodes, salivary glands, or lungs.
Symptoms and Diagnosis
Symptoms of ear cancer in dogs can be subtle, but they're often noticeable if you know what to look for. Visible growths in the ear, such as firm nodules or plaques, are a common sign, especially if they're pink, white, or purplish in color.
Tumors can also cause bleeding or discharge from the ear, accompanied by an unpleasant odor. Some dogs may exhibit mechanical problems like tilting their head, head shaking, or loss of balance due to itchiness or pain.
A thorough physical examination by a veterinarian is necessary to determine the extent of the tumor(s). They may perform blood tests, urinalysis, and biopsy to confirm the diagnosis. Advanced imaging with CT or MRI scans may also be suggested to determine the extent of the tumor(s).
Symptoms of Tumors
Symptoms of tumors in dogs can be subtle, but they're often noticeable if you know what to look for. Ear tumors can be firm nodules or plaques, usually located in the ear canals, auricular meatus, or pinna, and can be pink, white, or purplish in color.
Some ear tumors may not be visible at all, especially if they're located in the internal ear. A veterinarian may need to use a CT or MRI scan to visualize them. If you're concerned about your dog's ear health, it's always best to consult with a professional.
Tumors can cause bleeding or discharge from the ear, and may even give off a foul odor. This can be a sign that something's not right, and it's essential to investigate further.
If your dog is experiencing itchiness or pain in the ear, it can lead to some unusual behaviors. They may tilt their head, shake their head excessively, or even stumble and fall due to a lack of balance. These symptoms can also cause them to scratch or rub their ear constantly.
Here are some common symptoms of ear tumors in dogs:
- Visible growth in the ear
- Shaking head
- Stumbling or falling due to lack of balance
- Tilting the head
- Scratching or rubbing the ear
- Whining or crying in pain when ear is touched
- Foul smell in the ear
- Bloody or yellow discharge
- Chronic ear infections
Diagnosis of Tumors
To diagnose a tumor in your dog's ear, a thorough physical examination is necessary, including weight, blood pressure, temperature, and reflexes.
Your veterinarian will need to perform a complete physical examination, including weight, blood pressure, temperature, reflexes, pupil reaction time, heart rate, respiration rate, skin and coat condition, and breath sounds.
You'll need to inform your veterinarian about any medications your dog is taking, whether prescription or over-the-counter.
Be sure to describe the symptoms you've noticed and how long they've been going on to your veterinarian.
A complete blood count (CBC), chemical analysis, blood gases, liver enzyme panel, and blood urea nitrogen (BUN) may be necessary for general diagnostic tests.
A detailed otoscopic examination of the affected ear may be done to check for damage or other tumors, and your dog will be sedated for this procedure.
X-rays may be needed to look at the internal ear structure, and your dog will also be sedated for this.
In some cases, an ultrasound, MRI, or CT scan may be necessary for a more detailed examination.
A fine needle aspiration or biopsy of the tumor will be done to check for malignancy.
The veterinary pathologist at a specialized diagnostic lab will examine the cells of biopsied tissue under a microscope to provide a definitive diagnosis.
Other biopsies of the lymph node, as well as chest x-rays, may be performed to determine if the tumor has metastasized.
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Treatment and Recovery
Surgical excision is the treatment of choice for ear canal tumors, and laser surgery is very effective when available.
For benign tumors, surgical excision can be curative if the tumor is completely removed.
Aggressive surgery, including removal of the ear canal and cleaning out the inner ear, is the preferred treatment for malignant tumors.
This type of surgery, called a total ear canal ablation (TECA), is typically performed when the tumor has damaged or distorted the ear canal beyond repair.
Radiation therapy can be used to relieve pain and slow the growth of the tumor, and in some cases, it can be used to cure the cancer if surgical excision is incomplete.
Chemotherapy may be recommended if the tumor is aggressive or has spread to other parts of the body.
Treating ear cancer in dogs requires a strong commitment from the owner, including frequent trips to the veterinary hospital and potentially lengthy treatment periods.
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The timing of cancer therapy is critical for obtaining an optimal outcome, so it's essential to follow the veterinarian's instructions carefully.
After surgery, it's crucial to keep the operation site clean and prevent the dog from scratching or rubbing its ears to reduce the risk of infection and other complications.
Special collars may be placed on the dog to prevent scratching, and topical medications may be prescribed to aid in the healing process.
Your veterinarian will provide detailed instructions on post-surgical care and follow-up appointments, so be sure to follow their advice carefully.
Cost and Advice
The cost of treating canine ear cancer can be substantial, with a biopsy costing between $160 and $170.
You'll also need to consider the cost of anesthesia, which can be around $400 for a deep otoscopic exam to view the tumors.
The surgery to remove the tumor can range from $1,500 to $2,500, and radiation therapy can cost between $2,000 to $6,000.
Chemotherapy is another option, which can cost $1,000 per treatment, or a total of $6,000 to $10,000.
It's worth noting that these costs can vary depending on where you live, and it's always a good idea to consult with a veterinary oncologist to discuss a treatment plan and any lower-cost options.
Frequently Asked Questions
What does cancer look like on a dog's ear?
Ear cancer in dogs may appear as pink, white, or purple nodules in the ear canal. If benign, these growths can grow in size, but may not always cause problems
How long do dogs live with ear cancer?
Dogs with malignant ear canal tumors can live for almost 5 years on average, but those with extensive tumor involvement may have a poorer prognosis. Early detection and treatment can significantly impact a dog's survival and quality of life.
What are the signs of ear cancer?
Ear cancer symptoms include a persistent sore or spot on the ear flap that doesn't heal within 4 weeks, often accompanied by bleeding, itching, or a hard scaly surface
What is the survival rate for ear cancer?
The 5-year survival rates for ear cancer vary depending on the stage, with 64.9% survival rate for local, 34.2% for regional, and 0% for distant disease. Understanding the stage of ear cancer is crucial for determining the prognosis and treatment options.
Sources
- Dog Cancer Types, Symptoms, Treatments, and More (webmd.com)
- Oncology Service | School of Veterinary Medicine (ucdavis.edu)
- Tumors of the Ear Canal in Dogs - Dog Owners (merckvetmanual.com)
- Ear Cancer in Dogs - Symptoms, Causes, Diagnosis ... (wagwalking.com)
- Ear Tumors in Dogs - Symptoms, Causes, Diagnosis ... (wagwalking.com)
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