Symptoms2026-03-13Carelogy編集部
Cat Ear Mites (Otodectes): Symptoms, Treatment & Prevention in Multi-Cat Homes
How to identify ear mites in cats, distinguish from regular ear wax, treatment options, and preventing spread in multi-cat households. Includes home care tips.
Key Takeaway: Dark Ear Discharge + Intense Scratching Strongly Suggests Ear Mites
Cat ear mites (Otodectes cynotis) are an extremely common parasite — approximately 50% of kittens and rescue cats are infected.
Key identification signs:
- Dark brown-black ear discharge resembling coffee grounds (the most characteristic sign)
- Intense ear scratching and head shaking
- Red, swollen ear canals
- Scratch wounds around the ears from excessive scratching
The difference from normal ear wax (light brown to yellow) is the darkness and volume. Ear mite discharge is dry and granular — with a magnifying glass, you may even see tiny white dots (the mites themselves) moving.
Critical point: Ear mites spread extremely easily between cats, so in multi-cat households, all cats must be treated simultaneously.
Ear Mite Treatment Options & Costs
Veterinary treatment (recommended):
| Treatment | Effectiveness | Cost | Notes |
|-----------|--------------|------|-------|
| Revolution (selamectin) | Excellent | ¥1,500-3,000/dose | Applied to back of neck. Monthly × 2 months |
| Ivermectin injection | Excellent | ¥2,000-4,000/dose | Fast-acting. Two doses 2 weeks apart |
| Ear flush + topical drops | Good | ¥3,000-5,000 | Requires 2-3 vet visits |
Treatment duration: Usually 2-4 weeks for complete resolution. Treatment must span at least 3 weeks to cover the 21-day egg cycle.
Home care:
- Use vet-prescribed ear cleaning solution to gently remove debris
- Never use cotton swabs (risk of eardrum damage)
- Use cotton balls soaked in cleaning solution to gently wipe
Multi-cat households:
- All cats must be treated simultaneously (one untreated cat creates a reinfection loop)
- Wash all bedding and blankets in hot water (60°C+)
- Mites can survive off the host for several days
Regular parasite prevention prevents reinfection.
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What Happens If Ear Mites Go Untreated
Ear mites never resolve on their own. Left untreated, they cause these complications:
1. Chronic otitis externa (outer ear infection)
- Mite irritation inflames the ear canal, allowing secondary bacterial and yeast infections
- Foul-smelling discharge and pus from the ear
- Treatment becomes prolonged and expensive
2. Aural hematoma
- Intense head shaking ruptures blood vessels in the ear flap
- The ear swells dramatically with trapped blood
- Surgery required (¥15,000-30,000)
3. Middle/inner ear infection
- Infection spreads from the outer ear to middle and inner ear
- Balance problems (head tilt, inability to walk straight)
- Trembling and unsteadiness may develop
4. Skin spread
- Mites can migrate to the neck and back, causing full-body itching and hair loss
Early treatment costs ¥2,000-5,000. Delayed treatment can exceed ¥50,000.
Catch Ear Problems Early with CatsMe
Ear mites are easily and inexpensively cured when caught early. Use the CatsMe app to record daily behavior changes and never miss warning signs.
What CatsMe can do for you:
- AI facial expression analysis detects ear discomfort and pain early — cats with ear mites show characteristic ear-focused expressions
- Behavior change logging — Record ear scratching frequency, head shaking, and ear redness daily
- Symptom checker — Enter 'ear scratching,' 'dark ear discharge,' or 'head shaking' for cause and urgency assessment
- Vet-ready health reports — Accurately communicate symptom progression. In multi-cat homes, compare records across all cats
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