Dog Ear Infection: Causes, Symptoms & Treatment Guide

Your dog is shaking their head constantly, scratching at their ears, and there’s a strange odor. You look inside and see redness and discharge. Your dog has an ear infection.

Ear infections are one of the most common reasons dogs visit the veterinarian, affecting up to 20% of dogs. While painful and uncomfortable, ear infections are treatable when caught early.

But leaving them untreated can lead to serious complications including hearing loss and chronic pain.

This complete guide covers everything about dog ear infections: how to recognize symptoms, what causes them, treatment options, and most importantly, how to prevent recurring infections.

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What Is a Dog Ear Infection?

Ear infections (otitis) are inflammation of the ear canal.

Three types based on location:

Otitis externa:

• Most common (affects 80% of ear infections)
• Inflammation of external ear canal
• Between ear opening and eardrum
• Easiest to treat

Otitis media:

• Middle ear infection
• Behind eardrum
• Often follows untreated externa
• More serious

Otitis interna:

• Inner ear infection
• Deepest part of ear
• Affects balance and coordination
• Most serious, can cause permanent damage

Most infections start as otitis externa and progress deeper if untreated.

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Symptoms of Ear Infection

Behavioral Signs

Head shaking:

• Frequent, vigorous shaking
• Trying to dislodge discomfort
• Most obvious sign

Ear scratching:

• Pawing at ears constantly
• Rubbing ears on furniture or floor
• May cause self-injury from scratching

Head tilt:

• Holding head to one side
• Indicates more serious infection
• May affect balance

Pain when touched:

• Yelps or pulls away when ears touched
• Reluctance to have ears examined
• May become aggressive due to pain

Behavior changes:

• Lethargy
• Depression
• Loss of appetite
• Unusual irritability

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Physical Signs

Looking inside the ear:

Redness:

• Pink to dark red inflammation
• Swollen ear canal

Discharge:

• Yellow, brown, or bloody
• Thick or crusty
• May have foul odor

Odor:

• Yeasty or sweet smell (yeast infection)
• Foul, rotten smell (bacterial infection)
• Strong, unpleasant

Swelling:

• Ear canal narrowed
• Outer ear flap swollen or hot

Crust or scabs:

• Around ear opening
• On ear flap

Hair loss:

• Around ears from scratching

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Advanced Symptoms

If infection severe or spreads to middle/inner ear:

Balance problems:

• Stumbling, falling
• Walking in circles
• Leaning to one side

Hearing loss:

• Not responding to name
• Doesn’t react to sounds
• Temporary or permanent

Eye problems:

• Drooping eyelid on affected side
• Rapid eye movements (nystagmus)
• Indicates inner ear involvement

Facial paralysis:

• One side of face droops
• Nerve damage from infection
• Serious complication

If you see these symptoms, seek emergency veterinary care.

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Common Causes of Ear Infections

1. Bacteria

Most common cause of ear infections.

Common bacteria:

• Staphylococcus
• Streptococcus
• Pseudomonas
• E. coli

How infections start:

• Normal bacteria overgrow when conditions change
• Moisture, debris, or inflammation create environment
• Bacteria multiply rapidly

Bacterial infections often:

• Have yellow or green discharge
• Smell foul
• Cause severe inflammation

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2. Yeast

Second most common cause.

Malassezia yeast:

• Naturally present in small amounts
• Overgrows when conditions favorable
• Warm, moist environments ideal

Yeast infections:

• Brown, waxy discharge
• Sweet or musty odor
• Very itchy
• Often chronic and recurring

More common in dogs with allergies.

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3. Allergies

Leading underlying cause of recurring ear infections.

Types:

Food allergies:

• Beef, chicken, dairy, wheat common triggers
• Cause inflammation in ears
• Create environment for infection

Environmental allergies:

• Pollen, dust mites, mold
• Seasonal or year-round
• Ears become inflamed and infected

Contact allergies:

• Shampoos, cleaning products
• Directly irritate ear tissue

Managing allergies essential to preventing recurring infections.

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4. Ear Mites

Parasites living in ear canal.

More common in:

• Puppies
• Outdoor dogs
• Cats (can spread to dogs)

Symptoms:

• Intense itching
• Dark, coffee-ground-like discharge
• Highly contagious

Treatment:

• Anti-parasitic medication
• Treat all pets in household

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5. Foreign Objects

Objects lodged in ear canal:

• Grass seeds (foxtails)
• Plant material
• Dirt, small pebbles
• Cotton from cleaning

Cause:

• Direct irritation
• Secondary infection
• Pain and inflammation

Requires removal by veterinarian.

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6. Excessive Moisture

Ears that don’t dry properly:

• Swimming frequently
• Bathing
• Humid climate
• Rain exposure

Creates perfect environment:

• Bacteria and yeast thrive in moisture
• “Swimmer’s ear”

Prevention crucial for water-loving breeds.

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7. Ear Anatomy

Some breeds predisposed due to ear structure:

Floppy ears:

• Basset Hounds, Cocker Spaniels, Beagles
• Cover ear canal
• Reduce airflow
• Trap moisture

Hairy ear canals:

• Poodles, Schnauzers
• Hair blocks ventilation
• Traps debris and moisture

Narrow ear canals:

• Shar-Peis, Bulldogs
• Poor air circulation
• Difficult to clean

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8. Hormonal Imbalances

Thyroid disorders:

• Hypothyroidism common in dogs
• Affects skin and ear health
• Predisposes to infections

Cushing’s disease:

• Excess cortisol
• Weakens immune system
• Increases infection susceptibility

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9. Autoimmune Diseases

Immune system attacks ear tissue:

• Pemphigus
• Lupus
• Causes inflammation
• Secondary infections result

Requires immunosuppressive treatment.

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10. Tumors or Polyps

Growths in ear canal:

• Block drainage
• Trap debris
• Cause chronic infections

More common in older dogs.

May require surgical removal.

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When to See the Veterinarian

Always see vet for suspected ear infection.

Immediate veterinary care if:

Severe pain:

• Dog cries when ears touched
• Won’t allow examination
• Aggressive due to pain

Balance problems:

• Stumbling, falling
• Walking in circles
• Tilting head severely

Facial paralysis or drooping:

• One-sided facial droop
• Eye problems
• Indicates nerve involvement

Bleeding from ear:

• May indicate ruptured eardrum
• Trauma
• Serious infection

Swollen, hot ear flap:

• May be ear hematoma
• Blood-filled pocket
• Requires drainage

Symptoms lasting more than 2 days.

First-time ear infection or chronic recurring infections.

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Veterinary Diagnosis

Examination

Otoscopic exam:

• Veterinarian uses otoscope
• Lighted instrument to visualize ear canal
• Checks for foreign objects, tumors, eardrum status

May require sedation:

• If dog in severe pain
• Allows thorough examination
• Permits deep cleaning if needed

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Diagnostic Tests

Cytology:

• Sample of discharge examined under microscope
• Identifies bacteria, yeast, or mites
• Determines infection type
• Guides treatment choice

Culture and sensitivity:

• For resistant or chronic infections
• Identifies specific bacteria
• Tests which antibiotics work
• Takes several days for results

Allergy testing:

• If recurring infections suggest allergies
• Blood tests or skin testing
• Identifies triggers

Imaging:

• X-rays or CT scans
• For chronic cases or suspected middle ear involvement
• Identifies masses, polyps, or structural problems

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Treatment Options

Medications

Topical ear medications:

Antibiotics:

• For bacterial infections
• Applied directly to ear canal
• Common: gentamicin, enrofloxacin

Antifungals:

• For yeast infections
• Common: clotrimazole, miconazole

Anti-inflammatory:

• Reduces swelling and pain
• Often corticosteroids
• Improves comfort quickly

Many ear medications are combination products:

• Antibiotic + antifungal + steroid
• Treats multiple causes simultaneously
• Examples: Tresaderm, Mometamax, Easotic

Application:

• Clean ear first (vet demonstrates technique)
• Apply prescribed amount
• Massage base of ear
• Let dog shake head
• Usually twice daily for 7-14 days

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Oral medications:

For severe, deep, or chronic infections:

Oral antibiotics:

• For middle ear infections
• Resistant bacteria
• Severe cases
• 2-6 weeks typically

Oral antifungals:

• For systemic yeast issues
• Chronic yeast infections

Pain medication:

• NSAIDs for pain and inflammation
• Important for comfort

Allergy medications:

• Antihistamines
• Apoquel or Cytopoint
• Address underlying cause

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Ear Cleaning

Proper cleaning essential to treatment success.

Veterinary cleaning:

• Deep cleaning under sedation sometimes necessary
• Removes debris and discharge
• Allows medication to contact tissue
• Your vet will demonstrate home cleaning

Home cleaning:

• Use veterinary ear cleaner only
• Never hydrogen peroxide, alcohol, or vinegar
• Fill ear canal with cleaner
• Massage base of ear
• Let dog shake
• Wipe outer ear with cotton ball
• Frequency per vet instructions

Do not clean infected ears without veterinary guidance.

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Surgery

Rare, but necessary for:

Chronic infections unresponsive to treatment:

• Total ear canal ablation (TECA)
• Removes diseased ear canal tissue
• Last resort

Tumors or polyps:

• Surgical removal
• Biopsy

Ear hematomas:

• Drainage and suturing

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Home Care and Monitoring

Medication Administration

Tips for success:

Restraint:

• Have helper hold dog gently
• Wrap in towel if needed
• Stay calm; dog senses your stress

Technique:

• Lift ear flap up and back
• Insert tip just inside opening
• Squeeze prescribed amount
• Massage ear base for 30 seconds
• Release and let dog shake
• Wipe excess from outer ear

Timing:

• Give medications at same times daily
• Complete full course even if improved
• Stopping early allows infection to return

Reward:

• Treat and praise after medication
• Makes future treatments easier

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Preventing Scratching

Scratching worsens infection and causes self-injury.

E-collar (cone):

• Prevents dog from scratching ears
• Usually necessary during treatment
• Temporary but important

Alternatives:

• Soft recovery collar
• Inflatable donut collar
• Whatever prevents scratching

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Monitoring Response

Watch for improvement:

Within 3-5 days:

• Less head shaking
• Reduced scratching
• Less discharge
• Decreased odor

If no improvement after 3-5 days, contact vet.

Possible reasons:

• Wrong medication
• Resistant infection
• Underlying cause not addressed
• Medication not reaching deep enough

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Follow-Up Exams

Recheck exam essential:

• Usually 10-14 days after starting treatment
• Vet verifies infection cleared
• Examines ear canal thoroughly
• May need extended treatment

Never stop medications early even if dog seems better.

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Preventing Ear Infections

Prevention far better than treatment.

1. Regular Ear Checks

Weekly inspection:

• Look inside ears
• Check for redness, discharge, odor
• Early detection prevents severe infections

What’s normal:

• Pink, healthy tissue
• Little to no wax
• No odor
• No discomfort when touched

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2. Proper Ear Cleaning

Routine cleaning for prone breeds:

• Use veterinary ear cleaner
• After swimming or bathing
• Weekly or as recommended by vet

Never over-clean:

• Can irritate ears
• Disrupts natural balance
• Clean only as needed

Technique:

• Fill ear canal with cleaner
• Massage base
• Let dog shake
• Wipe outer ear
• Never insert cotton swabs deep into canal

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3. Keep Ears Dry

After water exposure:

Swimming or bathing:

• Dry ears thoroughly
• Use drying ear solution
• Lift ear flaps to air dry

Prevent water entry during baths:

• Place cotton balls gently in ear opening
• Remove after bath

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4. Hair Management

For hairy-eared breeds:

Regular plucking or trimming:

• Poodles, Schnauzers need this
• Professional groomer can do it
• Improves ventilation
• Reduces moisture and debris trapping

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5. Allergy Management

If allergies cause infections:

Food allergies:

• Elimination diet trial
• Hypoallergenic food
• Novel protein diets

Environmental allergies:

• Medications: Apoquel, Cytopoint
• Immunotherapy (allergy shots)
• Frequent bathing to remove allergens

Managing allergies prevents recurring infections.

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6. Address Underlying Conditions

Hormonal disorders:

• Treat hypothyroidism
• Manage Cushing’s disease

Regular veterinary care:

• Annual exams
• Blood work for seniors
• Early disease detection

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Breed-Specific Considerations

Floppy-Eared Breeds

Cocker Spaniels, Basset Hounds, Beagles:

Higher risk due to:

• Poor air circulation
• Trapped moisture
• Warm, dark environment

Prevention:

• More frequent ear checks
• Regular cleaning
• Dry thoroughly after water
• Consider tying ears up occasionally for airflow

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Hairy-Eared Breeds

Poodles, Schnauzers, Shih Tzus:

Ear hair traps debris.

Management:

• Regular hair removal
• Professional grooming every 6-8 weeks
• Daily ear checks

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Water-Loving Breeds

Labradors, Golden Retrievers, Spaniels:

Frequent swimming increases risk.

Prevention:

• Dry ears after every swim
• Use drying ear products
• More frequent ear cleaning

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Chronic or Recurring Infections

Some dogs suffer repeated ear infections.

Why Infections Recur

Underlying allergies:

• Most common cause
• Must be managed long-term

Resistant bacteria or yeast:

• Require culture and sensitivity testing
• May need different medications

Ear anatomy:

• Narrow canals
• Excessive hair
• May benefit from surgery in severe cases

Incomplete treatment:

• Stopping medications too early
• Infection returns

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Long-Term Management

For chronic cases:

Regular vet visits:

• Monitor ear health
• Adjust treatment as needed

Maintenance cleaning:

• Weekly or as directed
• Prevents buildup

Allergy control:

• Ongoing medication
• Diet management

Possible long-term medication:

• Some dogs need maintenance ear drops

Consider:

• Specialist referral (veterinary dermatologist)
• Advanced diagnostics
• Surgical options if quality of life severely affected

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Cost of Treatment

Veterinary costs vary by location and severity.

Initial Visit

Examination and diagnosis:

• Office visit: $50-100
• Cytology: $30-50
• Ear cleaning: $25-75
• Total initial: $100-225

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Medications

Ear drops:

• Generic: $20-40
• Brand name: $50-100
• Course: 7-14 days

Oral antibiotics:

• $20-60 for course

Pain medication:

• $15-40

Total medication: $50-200

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Follow-Up

Recheck exam:

• $50-100

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Chronic Cases

Culture and sensitivity:

• $100-200

Specialist referral:

• $150-300 initial consult

Allergy testing:

• $200-500

Surgery (TECA):

• $1,500-3,000+ per ear

Managing chronic infections expensive but necessary for quality of life.

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Common Questions

Q: Can ear infections go away on their own?
A: No. Ear infections require treatment. They won’t resolve without medication and may worsen, potentially causing permanent damage.

Q: Are ear infections painful for dogs?
A: Yes, very painful. Infected ears are inflamed, swollen, and sensitive. This is why treatment should start promptly.

Q: Can I use human ear infection medicine on my dog?
A: No. Dog ear anatomy differs from humans. Use only veterinarian-prescribed medications. Human medications may be ineffective or harmful.

Q: How long does it take for ear infection to clear?
A: With proper treatment, improvement usually within 3-5 days. Complete resolution typically 10-14 days. Chronic cases may take longer.

Q: Can ear infections cause permanent hearing loss?
A: Yes, if untreated or chronic. Severe infections can damage structures in ear, causing permanent hearing loss.

Q: My dog’s ear infection keeps coming back. Why?
A: Recurring infections usually indicate underlying cause not addressed—most commonly allergies. Also resistant bacteria, incomplete treatment, or anatomical issues. Needs thorough workup.

Q: Is it okay to clean my dog’s ears with hydrogen peroxide?
A: No. Hydrogen peroxide can damage ear tissue and isn’t effective cleanser. Use only veterinary ear cleaning solutions.

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The Bottom Line

Ear infections are painful but treatable conditions requiring prompt veterinary attention.

Key takeaways:

Symptoms: Head shaking, scratching, odor, discharge, redness, pain.

Common causes: Bacteria, yeast, allergies, ear mites, moisture, anatomy.

Always see vet for diagnosis and treatment. Do not attempt to treat at home without veterinary guidance.

Treatment: Topical and/or oral medications, cleaning, addressing underlying causes.

Complete full course of medications even if dog improves.

Prevention:

• Regular ear checks
• Proper cleaning when needed
• Keep ears dry
• Manage allergies
• Address underlying health conditions

Chronic infections require long-term management with veterinary guidance.

Early treatment prevents complications including hearing loss and permanent damage.

Work closely with your veterinarian for best outcomes.

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Has your dog had ear infections? What worked for you? Share experiences in comments!

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This article provides general information. Ear infections require veterinary diagnosis and treatment. Always consult your veterinarian if your dog shows signs of ear infection.