Dog Ear Infections: Signs, Treatment & Prevention

Your dog keeps scratching their ear and there’s a weird smell. Is this an ear infection? And what should you do about it?

In this guide, I’ll explain the signs of dog ear infections, what causes them, how they’re treated, and most importantly, how to prevent them. If you have a floppy-eared breed, this guide is especially for you.

Before we start: This is educational content, not veterinary advice. Always see your vet for proper diagnosis and treatment.

What We’ll Cover

• Signs your dog has an ear infection
• The three types of ear infections and their causes
• Breeds most at risk
• How vets diagnose and treat infections
• Home care and prevention strategies

Signs Your Dog Has an Ear Infection

Common Symptoms

• Head shaking or tilting to one side
• Scratching at the ear or pawing at it
• Rubbing ear on the floor or furniture
• Odor from the ear (smells yeasty or foul)
• Discharge that’s yellow, brown, or bloody

Other Warning Signs

• Redness or swelling of the ear canal or flap
• Crusting or scabs
• Pain when the ear is touched (your dog may yelp or pull away)
• In severe cases: balance problems or walking in circles

Critical: If your dog suddenly loses balance or walks in circles, this may indicate inner ear infection or vestibular disease. See your vet immediately.

Assessing Severity

Mild

• Occasional scratching
• Mild odor
• No pain

Moderate

• Frequent scratching
• Discharge
• Odor
• Some pain

Severe

• Constant scratching
• Swollen or closed ear canal
• Severe pain
• Balance issues

What You Should Do

Don’t wait and see with ear infections. They’re painful and won’t resolve without treatment.

Early treatment prevents complications. Call your vet for an appointment.

Types of Ear Infections and What Causes Them

Three Types Based on Location

1. Otitis Externa (Outer Ear Infection)

• Affects the ear canal
• Most common - 80% of ear infections are outer ear
• Usually caused by bacteria or yeast
• Easier to treat than middle or inner ear infections

2. Otitis Media (Middle Ear Infection)

• Behind the eardrum
• Often develops from untreated outer ear infections
• More serious and harder to treat
• Can affect balance

3. Otitis Interna (Inner Ear Infection)

• In the deepest part of the ear
• Most serious
• Can cause permanent hearing loss or balance problems
• Requires aggressive treatment

What Causes Ear Infections?

Allergies (Most Common Underlying Cause)

• Food allergies
• Environmental allergies to pollen, dust, or mold

Allergies cause inflammation that makes the ear susceptible to infection.

Moisture

Moisture creates the perfect environment for bacteria and yeast:

• Swimming
• Bathing
• Humid weather

Floppy-eared breeds are especially prone to “swimmer’s ear.”

Ear Anatomy

• Floppy ears trap moisture and limit airflow (Basset Hounds, Cocker Spaniels)
• Hairy ear canals trap debris (Poodles, Schnauzers)

Other Causes

• Ear mites (more common in puppies)
• Foreign objects like grass awns or foxtails
• Excessive cleaning or irritation
• Hormonal imbalances
• Tumors or polyps

The key: Treating the infection is important, but identifying the underlying cause prevents recurrence. Chronic ear infections usually have underlying allergies.

Breeds Most at Risk

Floppy-Eared Breeds

• Cocker Spaniels
• Basset Hounds
• Labrador Retrievers
• Golden Retrievers
• Bloodhounds
• Beagles

Floppy ears trap moisture, limit airflow, and create a dark, warm environment perfect for bacteria and yeast.

Hairy Ear Canal Breeds

• Poodles
• Schnauzers
• Bichon Frises
• Shih Tzus

Hair traps debris, moisture, and wax.

Allergy-Prone Breeds

• Bulldogs
• West Highland White Terriers
• German Shepherds

Allergies are an underlying cause of chronic infections.

Water-Loving Breeds

• Labrador Retrievers
• Golden Retrievers

Frequent swimming increases moisture exposure.

If you have one of these breeds, preventive care is crucial. Don’t wait for infection to develop.

How Vets Diagnose and Treat Ear Infections

Diagnosis

Visual Examination

Your vet looks at the ear canal with an otoscope:

• Check for redness, swelling, discharge
• Look for foreign objects
• Examine the eardrum if visible

Ear Cytology

• Vet takes a sample of discharge
• Views it under a microscope
• Identifies bacteria, yeast, or ear mites
• Determines appropriate treatment

Additional Tests (If Needed)

• Culture for resistant infections
• Allergy testing if chronic infections
• Imaging (X-rays or CT) for middle or inner ear problems

Treatment for Outer Ear Infections

Most common type:

1. Ear cleaning in the vet office to remove debris
2. Topical medications - Antibiotic or antifungal ear drops
3. Treatment duration - Usually 1-2 weeks
4. Oral medications if severe or middle ear is involved

Treatment for Chronic or Recurring Infections

• Address the underlying cause (allergies, anatomy)
• Create long-term management plan
• Regular ear cleaning schedule
• Sometimes surgery for severe cases

What to Expect

• Improvement in 3-5 days typically
• Complete the full treatment course even if symptoms resolve
• Recheck appointment to confirm infection cleared
• Stopping treatment early leads to recurrence and antibiotic resistance

Home Care and Prevention

Proper Ear Cleaning

Use vet-approved ear cleaner only. Not water, alcohol, or hydrogen peroxide.

How to Clean:

1. Squeeze cleaner into the ear canal
2. Massage the base of the ear for 30 seconds
3. Let your dog shake their head
4. Wipe out visible debris with a cotton ball
5. Never use Q-tips deep in the canal - You can damage the eardrum

How Often to Clean

• After swimming or bathing
• Weekly for prone breeds
• As directed by your vet for ongoing infections

Prevention Strategies

✅ Dry ears thoroughly after swimming or baths ✅ Use a drying agent ear cleaner for water-loving dogs ✅ Keep ear hair trimmed - Ask your groomer or vet ✅ Address underlying allergies ✅ Regular vet checkups for prone breeds ✅ Don’t over-clean - Can cause irritation

What You Should NOT Do

❌ Don’t use home remedies without vet approval ❌ Don’t use leftover ear medication from a previous infection (may be wrong treatment) ❌ Don’t skip a vet visit hoping it will resolve on its own ❌ Don’t stop medication early when symptoms improve ❌ Don’t use human ear drops

When to Call Your Vet

• Any signs of ear infection (scratching, odor, discharge, pain)
• Balance problems or head tilt
• Ear infection not improving after 3-5 days of treatment
• Recurring ear infections (more than 2-3 per year indicates underlying problem)

Common Mistakes Pet Owners Make

Mistake #1: “Ear infections will go away on their own”

Not true. Ear infections do NOT resolve without treatment. They’re painful and will worsen over time. Untreated infections can spread to the middle or inner ear, causing serious complications.

Mistake #2: “I can use leftover ear drops from last time”

No. Different infections need different treatments:

• Last time might have been yeast
• This time might be bacteria

Using the wrong medication makes the infection worse and creates antibiotic resistance. Always get a new diagnosis.

Mistake #3: “I should clean my dog’s ears every day to prevent infection”

Actually, over-cleaning can cause irritation and actually increase infection risk.

Clean only:

• After water exposure
• As directed by your vet
• For most dogs, weekly or less is sufficient

Mistake #4: “If symptoms improve after a few days, I can stop the medication”

No. Complete the full treatment course even if symptoms resolve.

Stopping early:

• Allows remaining bacteria to multiply
• Creates antibiotic-resistant bacteria
• Makes future infections harder to treat

Quick Reference Summary

✅ 20% of dogs have ear disease ✅ Watch for signs: Head shaking, scratching, odor, discharge, or pain ✅ Floppy-eared and water-loving breeds are most at risk ✅ Don’t wait and see - Get proper vet diagnosis and treatment ✅ Complete the full medication course ✅ Focus on prevention: Dry ears after water, clean weekly if prone, address allergies

The Bottom Line

You now know how to recognize, treat, and prevent ear infections in your dog. Early intervention prevents complications and keeps your dog comfortable.

Remember: Complete the full treatment course even when symptoms improve. This prevents antibiotic resistance and recurrence.

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Sources

All information is sourced from trusted veterinary resources:

1. VCA Animal Hospitals - Ear Infections in Dogs
2. PetMD - Dog Ear Infection Guide
3. American Kennel Club - Ear Care for Dogs