Cat Ear Mites

Yes, I know this is a ferret! It does show the build up of dark brown to black ear wax caused by the presence of the cat ear mites in the outer ear canal. This parasite is not restricted to the domestic cat, which makes this photo valid and a useful illustration (I was unable to find a suitable photo of a cat with the condition). Photo Stacy Lynn Baum under a creative commons license.

Ear mites (minute crab like creatures) are one of the causes of inflammation of the outer ear canal (scientific term for this inflammation is Otitis externa). The outer ear canal is the tube that runs from outside to the ear drum (the pathway for the reception of sound), which can be seen when looking at the ear. Otitis externa affects humans and often swimmers as it is called "swimmer's ear" in humans.


This YouTube video show ear mites under a microscope. They are not actually in the ear in this video.

There are many possible causes of Otitis externa in cats. The cause of the inflammation can be complicated by the instinctive reactions of the cat when he/she scratches an ear than is irritating her. This leads to tissue damage, which can then lead to infection by bacteria and fungi. A cycle starts when the cat scratches more and so on. A cat may also shake her head when mites are present in her ears. These are signs of infestation.

Cat ear mites are a known possible underlying cause, however, and the most common cause. The scientific name for an ear mite is Otodectes cynotis and the condition of infestation is called Otocarisis or "canker". The term canker is also used for any long term outer ear canal inflammation. About 50% of Otitis externa is caused by cat ear mites. The percentage is much lower for dogs. Cats can tolerate a higher level of infestation than dogs and if there are dogs and cats in the same household the cat could infect the dog with ear mites as a consequence. Apparently a high percentage of cats have ear mites at one time (one website quotes 90%, although this seems high to me)

The mites stimulate the production of wax by glands situated in the ear canal (these wax producing glands are called ceruminous glands). Excessive production of wax forming a thick brown/black layer is a sign of infestation of cat ear mites. They can be seen with the use of a special device called and auriscope (a kind of illuminating magnifying glass). Although some veterinarians may have a Video Otoscope, a device which transmits an image of the inside of the ear to a screen allowing more than one person to see (including the cat keeper). The mites appear as moving/crawling white objects on the brown/black wax, which is sometimes referred to as ear mite dirt.


Home remedies for cat ear mites (or any animal with eat mites I guess). Photo by Stacy Lynn Baum under a creative commons license. There is though not real substitute to seeing a veterinarian.

The cure seeems relatively straight forward but there can be complications. It is important to make sure that the symptoms you see are being caused by ear mites as treatments for ear mites can complicate other causes that have not been spotted.

An acaricidal drug is administered into the outer ear canal after the ear has been cleaned (with extreme care and in safe manner). If the ears are not cleaned the wax build up can shelter the mites and prevent the drug working effectively. I understand this drug to be a kind of insecticide. In order to prevent recurrence of infestation all dogs and cats in contact with the infected cat should be treated.

The treatment should continue long enough to interfere with the 21 day cycle of the ear mite and kill the mites that are in the eggs. In addition the cat ear mites will migrate from the ear to other parts of the body during the treatment (including the tail as it is sometimes near the ear when the cat is sleeping). The cat's body should therefore also be treated with an appropriate insecticide preparation. I have tried one of these once for my cat and I didn't like the effect, she licked it off and started foaming at the mouth. I had to take her to the vets but it was OK in fact.

Home treatment remedies are, as you can see, available (my cat touch wood has never suffered from eat mites). On a commonsense level, if my cat had suffered from this condition in the past I would regularly inspect her ears and if infected ask the vet for medication that could be administered by me.

Cat Ear Mites to cat anatomy

Source:

• Veterinary Notes for Cat owners
• BBC health
• The Veterinarians' Guide to Your Cats Symptoms
• Cat Owner's Home Veterinary Handbook by Drs Carlson and Giffin
  

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