TL;DR: Pus in a cat's ear indicates a painful infection that requires veterinary attention within 24-48 hours to prevent hearing loss or neurological damage. Seek immediate care if your cat is also stumbling or tilting its head.
What does it mean if my cat has pus oozing from their ear?
Pus, or purulent discharge, is a sign that your cat's body is fighting an infection. When you see thick yellow, white, or green fluid coming from the ear canal, it is usually the result of a severe bacterial or yeast infection, known as otitis externa. This discharge is often accompanied by a strong, unpleasant odor, redness of the ear flap, and visible discomfort. In some cases, it may indicate a more serious underlying issue like a ruptured eardrum, a foreign object trapped in the canal, or even an infected growth or polyp.
Is pus in my cat’s ear a veterinary emergency?
- Pus in the ear is a Medium Urgency situation that requires medical intervention for pain and infection.
- If left untreated, the infection can travel to the inner ear, leading to permanent hearing loss, loss of balance, or neurological issues.
- You should aim to have your cat seen by a veterinarian within 24 to 48 hours.
- Seek an immediate consultation if your cat is also tilting their head significantly, stumbling, or acting lethargic.
Why should I take a photo of my cat's ear discharge to help with triage?
- A clear, well-lit photo allows the vet to see the discharge before your cat grooms it away.
- Photos help the veterinary team identify the original color, consistency, and volume of the pus.
- Visualizing the level of swelling helps the clinic determine how quickly your pet needs to be squeezed into the schedule.
Clinical Context (Merck Veterinary Manual)
In cats, purulent discharge (otorrhea) from the ear canal, often accompanied by inflammation, head shaking, scratching, and head tilting, is indicative of otitis externa or media. Self-trauma can lead to aural hematoma, and the hair surrounding the ear may be wet or matted. Underlying causes, including otitis media, must be identified and managed to prevent recurrence. Concurrent otitis media should be suspected, especially in cases of recurrent otitis externa. Animals with otitis media may exhibit signs of facial nerve paralysis (ear droop, lip droop, ptosis, collapse of the nostril) and/or Horner syndrome (miosis, ptosis, enophthalmos, protrusion of the nictitating membrane) on the affected side. Management should include addressing primary causes, removing exudate via ear canal irrigation, and selecting appropriate topical and systemic medications. Glucocorticoids can be beneficial in decreasing swelling of the ear canal.
Chapter: Dermatology
Source: The Merck Veterinary Manual, 11th Edition (Page 529)