Pus discharge within a dog's ear indicates infection by microorganisms. Pus is dead and dying white blood cells. These cells are sent by the body to sites of infection to kill and digest live infectious agents.
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Types of Ear Infection
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The outer and middle ear canals are the most common sites of infection. Most canine ear infections are otitis externa, infection of the outer ear canal, or otitis media, infection of the middle ear canal. Otitis externa can spread and cause otitis media.
Predispositions
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Constant ear infections are a sign of a bigger problem. Chronic ear infections may be a symptom of an underlying condition. Food allergies and glandular diseases (such as thyroid disease) can cause dogs to have thicker than normal ear wax, which leads to infections when dirt, debris and microorganisms become trapped.
Foreign Object
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Seeds, burrs and dirt can cause painful infections. Foreign objects lead to ear infections when they damage the ear and provide a site for germs to multiply. These objects can come from outside, like plant seeds, or can be mats of the dog's own ear hair--a particular problem in wiry-haired breeds.
Bacterial Infections
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Foreign objects can wound the ears and create a place for bacteria to grow. Bacterial infections are common in wounds caused by foreign objects. Oral antibiotics will be prescribed along with ear cleaning. Pus is often most visible in bacterial infections.
Fungal Infections
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Dogs with floppy ears are at higher risk for some infections. Fungal infections are caused when yeasts that normally live on the tissues grow out of control. These are most common in floppy-eared breeds. Redness and itchiness may be more pronounced with these infections. Antifungal medications will be prescribed.
Treatment
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Untreated ear infections are painful and can cause permanent damage to your pet. It is important to have a veterinarian examine your pet to prescribe treatment and prevention. A foreign body left within the ear, or improper medication for the type of infection, can lead to further pain, damage and hearing loss. Medication for a severe infection is usually oral as well as topical.
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