TL;DR: Dark, foul-smelling ear discharge in cats usually indicates ear mites or an infection and requires a veterinary exam within 24–48 hours. Seek immediate care if your cat exhibits a head tilt, loss of balance, or extreme lethargy.
What causes my cat to have dark, foul-smelling ear discharge?
- This symptom is most commonly associated with ear mites, yeast infections, or bacterial overgrowth.
- The dark material is typically a combination of earwax, blood, and inflammatory debris.
- A strong, foul odor usually points toward an active infection that requires professional medical intervention.
Is my cat’s ear discharge a medical emergency?
- The urgency level is Medium; you should seek an appointment within 24 to 48 hours.
- While not usually a life-threatening ER visit, it is a painful condition that needs prompt attention.
- Seek immediate care if your cat shows a head tilt, loss of balance, or extreme lethargy, as these can indicate the infection has reached the inner ear.
How does taking a photo of the ear help the vet triage my cat?
- A high-quality photo allows the triage team to see the color and texture of the discharge.
- It helps distinguish between the 'coffee-ground' appearance of mites and the moist, yellow-brown discharge of yeast.
- Visuals of swelling or redness help the team assess your cat's pain level and prioritize your appointment.
Clinical Context (Merck Veterinary Manual)
In cats, foul-smelling, dark ear discharge can indicate otitis externa or media/interna. Clinical signs may include head shaking, rubbing or scratching at the affected ear, and head tilting. Self-trauma can lead to aural hematoma. Otitis media may present with facial nerve paralysis (ear droop, lip droop, ptosis, collapse of the nostril) or Horner syndrome (miosis, ptosis, enophthalmos, protrusion of the nictitating membrane). Diagnosis involves otic cytology, skin scrapings, cleansing, and topical antimicrobial/anti-inflammatory therapy. Management of pain and pruritus should be included in the initial treatment, potentially with tramadol. Glucocorticoids can be beneficial in decreasing swelling of the ear canal.
Chapter: Dermatology, ENT
Source: The Merck Veterinary Manual, 11th Edition (Page 1834)