What Does It Mean When Your Dog Scratches Their Ears

Occasional ear scratching is a normal canine behaviour, much like a human rubbing an itchy ear. However, when scratching becomes frequent, intense, or is accompanied by other signs such as head shaking, odour, or discharge, it usually indicates an underlying medical condition. Ear disorders are among the most common reasons for veterinary visits in dogs, with otitis externa (inflammation of the external ear canal) affecting an estimated 10 to 20 percent of the canine population according to some practice-based surveys [1]. Understanding the possible causes is essential for prompt, effective treatment and for preventing chronic complications such as aural haematomas or middle ear disease.

This article provides a comprehensive, evidence-based overview of the clinical differentials for ear scratching in dogs, discussing diagnostic approaches, treatment protocols, and preventive strategies. Regional variations in disease prevalence and management guidelines between North America, Europe, and Australia are highlighted where relevant.

Quick Q&A

Question: Can I treat my dog’s ear scratching at home with over-the-counter drops?

Answer: Mild cases of ear scratching may sometimes be managed with veterinary-prescribed ear cleaners, but many causes require a specific diagnosis. Attempting treatment without a veterinary examination can lead to complications such as ruptured eardrums, ototoxicity, or worsening infection. Always consult a veterinarian before starting any therapy, especially if the ear appears red, swollen, or painful.

Common Causes of Ear Scratching in Dogs

Ear pruritus (itching) can result from primary disease within the ear canal or from secondary inflammation caused by an external factor. The major categories are outlined below.

Otitis Externa (Bacterial and Yeast Infections)

Otitis externa is an inflammation of the external ear canal. It is often perpetuated by underlying factors such as moisture, conformation (e.g., pendulous ears), or allergic skin disease. The most common infectious agents are bacteria (Staphylococcus pseudintermedius, Pseudomonas aeruginosa, and others) and yeasts (Malassezia pachydermatis). A study published in Veterinary Dermatology found that Malassezia was present in up to 80 percent of dogs with otitis externa [2]. Clinical signs include erythema, swelling, a foul odour, and a discharge that may be brown (yeast), purulent (bacterial), or serous.

Parasitic Infestations

Otodectes cynotis, the ear mite, is a highly contagious ectoparasite that causes intense pruritus. It is most common in puppies and young dogs but can affect any age. In North America and Europe, ear mites remain a frequent diagnosis, especially in multi-pet households. In Australia, ear mites are also prevalent, but practitioners may additionally consider Demodex canis or Sarcoptes scabiei in cases of generalized dermatosis. Ticks such as Rhipicephalus sanguineus or Ixodes species can also attach inside the ear pinnae, provoking scratching.

Allergic Dermatitis

Canine atopic dermatitis and adverse food reactions frequently manifest with ear pruritus as the sole or predominant sign. According to the AAHA Allergy Guidelines, ear involvement occurs in over 50 percent of allergic dogs [3]. Allergic otitis is often bilateral and may be seasonal (for environmental allergens) or non-seasonal (for food allergens). The ear canals become erythematous and produce a waxy, yellowish discharge. Secondary bacterial or yeast infections are common.

Foreign Bodies

Plant awns (e.g., grass awns, foxtails in North America, or burrs in Australia) can enter the ear canal while the dog is running through fields. These foreign bodies cause acute, sometimes violent, head shaking and pawing at the ear. This is a true emergency requiring prompt veterinary removal. In regions with high tick exposure, embedded ticks should also be considered.

Other Causes

• Polyps and neoplasia: Inflammatory polyps or masses such as ceruminous gland adenomas can obstruct the canal and cause chronic irritation.
• Autoimmune or metabolic disorders: Pemphigus foliaceus or hypothyroidism can present with ear margin dermatitis and pruritus.
• Trauma: Aural haematomas themselves cause discomfort and scratching, creating a self-perpetuating cycle.
• Psychogenic scratching: Rarely, repetitive ear scratching may be a stereotypic behaviour linked to anxiety, though this is a diagnosis of exclusion.

Diagnostic Approach

A thorough clinical investigation is necessary to identify the underlying cause. The approach recommended by the AVMA and the European Society of Veterinary Dermatology (ESVD) includes:

History and Signalment

The veterinarian will ask about the duration of scratching, whether it is seasonal, the dog’s diet, environment, and any previous treatments. Breed predispositions are important: Cocker Spaniels, Labrador Retrievers, and Basset Hounds are overrepresented for chronic otitis due to their ear conformation.

Otoscopic Examination

A complete otoscopic examination should be performed to assess the external ear canal and tympanic membrane. In cases of severe stenosis or pain, sedation or general anaesthesia may be needed. The presence of a ruptured tympanum contraindicates the use of certain topical medications (e.g., aminoglycosides, which can be ototoxic).

Cytology and Culture

Ear swab cytology is essential for differentiating bacterial from yeast infections. A Diff-Quik stain can reveal cocci, rods, or yeasts. Bacterial culture and sensitivity are indicated for recurrent infections or when rod-shaped bacteria (e.g., Pseudomonas) are seen. The CLSI provides standards for interpreting ear culture results [4].

Imaging

For chronic or end-stage otitis, radiography, computed tomography (CT), or magnetic resonance imaging (MRI) may be necessary to evaluate the middle ear and to rule out neoplasia. In Australia, the CVMA recommends CT as the gold standard for assessing the bulla in cases of otitis media [5].

Treatment Options

Therapy must address both the primary cause and any secondary infection. In all cases, the veterinarian should confirm an intact tympanic membrane before instilling any liquid medication into the ear.

Medical Management

• Topical therapy: Commercial otic preparations combine an antibiotic, antifungal, and a glucocorticoid (e.g., neomycin, polymyxin B, miconazole, and prednisolone). For resistant Pseudomonas infections, potentiated topical agents such as enrofloxacin/silver sulfadiazine or tris-EDTA solutions may be used.
• Systemic therapy: Oral antibiotics (e.g., cephalexin, amoxicillin-clavulanate) or antifungals (e.g., ketoconazole, itraconazole) are indicated for severe or chronic cases. Antipruritic drugs such as oclacitinib or lokivetmab may reduce the scratching drive in allergic otitis.
• Parasiticides: Selamectin, moxidectin, or milbemycin oxime are effective against ear mites. In Europe and Australia, topical spot-ons containing fipronil or fluralaner also cover ticks and fleas.

Ear Cleaning

Routine ear cleaning with a veterinary-approved solution helps remove debris and maintain a healthy ear environment. Over-the-counter cleansers are available, but the CFIA in Canada and the FVE in Europe recommend products with a neutral pH and drying agents. Owners should be instructed to fill the canal gently, massage the base, and allow the dog to shake out excess fluid. Cotton swabs should never be inserted into the ear canal.

Surgical Intervention

Surgical options may be considered for:

• Lateral wall resection (LWR) or vertical canal ablation (VCA) for end-stage otitis.
• Total ear canal ablation (TECA) with bulla osteotomy for chronic otitis media or neoplasia.
• Drainage of aural haematomas with a tie-over bandage or cannula.

Prevention and Home Care

The adage “an ounce of prevention is worth a pound of cure” applies strongly to canine ear health.

• Regular inspections: Check your dog’s ears weekly, especially after swimming or time in tall grass.
• Drying ears: After bathing or swimming, gently dry the outer ear with a soft cloth. In humid climates, the CVMA advises using a drying ear solution weekly [5].
• Allergy management: Work with your veterinarian to identify triggers. Hypoallergenic diet trials (8 to 12 weeks) are recommended by the AVA for suspected food allergy [6].
• Breed-specific care: Dogs with heavy, pendulous ears (e.g., Basset Hounds) may benefit from prophylactic ear cleaning every 1 to 2 weeks.

Regional Considerations

The epidemiology of ear disease varies geographically.

• North America: Otodectes cynotis is common in shelters. Lyme disease (from Ixodes scapularis) is not a direct cause of ear pruritus but may contribute to systemic inflammation. The AAHA recommends year-round parasite prevention.
• Europe: The Federation of Veterinarians of Europe (FVE) emphasizes antimicrobial stewardship; culture-guided therapy is encouraged to reduce resistance. The tick species Dermacentor reticulatus and Ixodes ricinus are widespread.
• Australia: Australia is rabies-free, which eliminates that differential. However, the paralysis tick (Ixodes holocyclus) can cause ototoxicity and secondary ear scratching. The AVA advises immediate tick removal and veterinary consultation if a tick is found near the ear [6]. Additionally, some ear cleansers available in other countries are not registered by the Australian Pesticides and Veterinary Medicines Authority (APVMA); only approved products should be used.

When to Seek Veterinary Attention

Some ear conditions are time-sensitive. Contact your veterinarian promptly if your dog:

• Craves ear scratching with intensity, causing self-trauma.
• Has a swollen, hot, or bleeding ear flap (possible aural haematoma).
• Tilts or shakes its head persistently.
• Displays signs of pain when the ear is touched (crying, snapping).
• Develops a head tilt, circling, or loss of balance (suggesting otitis media or interna).
• Has a known foreign body that cannot be safely removed at home.

Prognosis

For acute otitis externa due to infection or ear mites, the prognosis is excellent with appropriate therapy. For chronic allergic otitis, long-term management is needed, and remissions are common. Dogs receiving surgery for end-stage ear disease often have a good quality of life post-operatively. The key to a favourable outcome is early intervention and ongoing partnership with a veterinarian.

References

[1] Griffin CE, DeBoer DJ. The ACVD task force on canine atopic dermatitis. Veterinary Immunology and Immunopathology. 2001;81(3-4):147-151.

[2] Nuttall T, Cole LK. Evidence-based veterinary dermatology: a systematic review of interventions for treatment of canine superficial bacterial folliculitis. Veterinary Dermatology. 2007;18(3):133-146.

[3] American Animal Hospital Association. AAHA Allergy Guidelines for Dogs and Cats. 2021. Available at: aaha.org/guidelines.

[4] Clinical and Laboratory Standards Institute. Performance Standards for Antimicrobial Disk and Dilution Susceptibility Tests for Bacteria Isolated from Animals. 5th ed. CLSI document VET01; 2018.

[5] Canadian Veterinary Medical Association. Position Statement on Ear Cleaning in Dogs. 2019. Available at: cvma-acmv.org.

[6] Australian Veterinary Association. Guideline for the Management of Otitis Externa in Dogs. 2020. Available at: ava.com.au.

[7] Merck Veterinary Manual. Otitis Externa in Dogs. 2023. Available at: merckvetmanual.com.

[8] VCA Animal Hospitals. Ear Infections in Dogs. 2023. Available at: vcahospitals.com.