Middle and Inner Ear Infections in Dogs Otitis media (inflammation of the middle ear) and otitis interna (inflammation of the inner ear) are often caused by a bacterial or yeast (fungal) infection. Infection of the middle and inner parts of the ear passages can affect dogs of any breed or age. However, some breeds are more susceptible to ear infections. These include dogs with long, floppy ears, such as the Labrador Retriever, Beagle, and Basset Hound. Continue reading to learn more about the common symptoms, causes, and treatments for middle and inner ear infections in dogs. Anatomy of a Dog’s Middle and Inner Ear Symptoms of Middle and Inner Ear Infections in Dogs Causes of Ear Infections in Dogs How Middle and Inner Ear Infections are Diagnosed in Dogs Can my dog recover from a middle or inner ear infection? Read more: Need to speak with a veterinarian regarding your dog’s ear infection or another condition? Are you concerned about your pet?Book a video consultation with an experienced veterinarian within minutes.Professional vet advice onlineLow-cost video vet consultationsOpen 24 hours a day, 365 days a year Book Video Consultation Anatomy of a Dog’s Middle and Inner EarTo better understand why the symptoms of middle and inner ear infections in dogs include neurological signs, let us first tackle the basic anatomy of the middle and inner ear.Tympanic MembraneThe tympanic membrane or eardrum separates the outer part of the ear canal from the middle and inner ear. It acts as a “wall” that prevents the entry of foreign substances into the more sensitive parts of the ear.The eardrum is very fragile. It can be damaged during ear cleaning or by ear disease. If the eardrum is damaged, such as when it’s perforated, torn, or ruptured, bacteria and fungi from the external ear canal can enter the middle ear and cause an infection. Inflammation in the middle ear may eventually lead to otitis interna.Middle EarThe middle ear is an air-filled cavity where you can find the 3 smallest bones of the dog’s body, known as the stapes, malleus, and incus, which are important in hearing. The Eustachian tube extends from the bulla (air-filled cavity) to the back of the dog’s throat. Air enters the Eustachian tube into the middle ear to balance the pressure against the tympanic membrane (eardrum).Inner EarThe inner ear is responsible for maintaining the dog’s balance or equilibrium. This can be achieved with the help of the semicircular canals which are filled with fluid. Nerves that connect to the brain can also be found in the inner ear.Symptoms of Middle and Inner Ear Infections in DogsThe symptoms that are exhibited in dogs with otitis media or interna will depend to a large extent on the severity and extent of the infection. There may be no visible symptoms in mild cases, but the more serious infections can affect the nervous system, leading to neurological symptoms.If symptoms are present, these may include:Pain when your dog opens his mouthReluctance to chewHead-shakingPawing and scratching of the affected earRedness of the earsEar dischargeBulging eardrum (tympanic membrane) when there is a buildup of pus in the middle and inner earVomitingIf the eardrum has ruptured, signs may also include the following:Thick ear discharge that may appear pus-like or bloodySudden loss of hearingThe ear canal is red and inflamedThe ear is painful to the touchWhen the infection spreads to the internal ear, otitis interna is characterized by:Head-tilting towards the affected earBalance problemsIncoordinationPupils are unequal in sizeInvoluntary eye movement (nystagmus)Paralysis or inability to blink when there is damage to the nervous systemDeafness may be present when both ears are affectedCauses of Ear Infections in DogsThe primary cause of ear infections in dogs is bacteria. Other disease-causing agents include yeast or fungi (Malassezia or Aspergillus) and ear mites.Some factors can increase a dog’s predisposition to infections in the middle and inner ear. These include trauma, tumors in the ear, or the presence of foreign bodies (foxtail or awn) in the ear.How Middle and Inner Ear Infections are Diagnosed in DogsIn addition to a thorough medical exam, there are specific diagnostic procedures that can be performed.About half of the dogs suffering from chronic otitis externa are found to be suffering from an infection of the middle ear. It is often difficult to get a definite diagnosis if the dog’s eardrum is intact.If the eardrum appears to be bulging or discolored, your vet may puncture it with a sterile needle so the discharge that has accumulated can flow to the outer ear passage and be cleaned up. This can also help relieve the pressure and the pain in the middle ear.Your vet may get a swab of the discharge for culture to identify the underlying culprit - whether it’s bacteria or yeast or both, and the specific species so the right medication can be given.Dogs that are prone to ear infections will benefit from a regular exam for any red flags that indicate a potential ear problem. This will allow early diagnosis so appropriate treatment can be given as soon as possible.A ruptured eardrum or a middle ear infection can be diagnosed when your dog undergoes a medical checkup by your vet. Your dog may need to be sedated or anesthetized to allow a thorough ear exam.Myringotomy - This technique involves inserting a sterile needle into the eardrum membrane to obtain a sterile fluid sample from the middle ear for culture and analysis. This can help determine if any infection is present.Radiographs - X-rays of the skull can help determine the severity of a middle ear infection.Analysis of the cerebrospinal fluid (CSF)UrinalysisBlood TestsComputed Tomography (CT) scanMagnetic Resonance Imaging (MRI) scanCan my dog recover from a middle or inner ear infection?The prognosis is good for the majority of patients whose ear infections are without serious complications. Even without surgery, most ruptured eardrums heal without surgical intervention.However, dogs with chronic inflammation in the middle ear that has led to the rupture of the eardrum have reduced chances of successful treatment. If nerves in the ear are affected, neurological signs may persist even after the infection has cleared up.If there is severe nerve damage, there may be permanent neurological defects in the dog’s face, eyes, and/or lips. There may also be partial or total loss of hearing.Middle and inner ear infections often require long-term antibiotics or antifungal medications (about 6-8 weeks). Frequent visits to the vet for rechecks and follow-up care are necessary to monitor the patient’s response to medication and ensure the infection is resolving and the eardrum is healing as it should.It is extremely important that you follow the instructions of your vet to ensure proper healing without serious complications.Read more:Causes of Fainting and Dizziness in DogsVestibular Disease in Dogs10 Facts About Your Dog’s EarsNeed to speak with a veterinarian regarding your dog’s ear infection or another condition?Click here to schedule a video consult to speak to one of our vets. You can also download the FirstVet app from the Apple App Store and Google Play Stores.