Myositis is an acute (of sudden onset), non-infectious inflammation of one or more of your dog's muscles which, if allowed to progress, can cause skeletal damage. It is, according to Vet Specialists, a serious and painful condition and can sometimes be indicative of an even more serious ailment.
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Causes
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According to Pet Place, myositis is generally caused by parasitic infestation, viral infection, abnormal immune response, ehrlichia (tick borne disease), paraneoplastic syndrome (secondary illness or symptom of cancer) or medication.
Symptoms
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Symptoms of myositis can vary, depending on which muscles are affected. Watch for muscle swelling; atrophy; difficulty swallowing, eating or drinking; regurgitation of fluid, mucus and food from the esophagus; exercise intolerance; stiff or stilted gait; swollen, sunken or protruding eyes; or general signs of muscle pain.
Diagnosis
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According to Pet Place, the most conclusive test in diagnosing myositis is a muscle biopsy. In order to determine the cause of the myositis, your veterinarian may order a complete blood count (CBC), biochemical profile, urinalysis, titers, x-rays, ultrasound, esophagram, fluoroscopy or electromyographic evaluation (EMG).
Treatment
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Treatment for myositis is generally aimed at the underlying cause of the condition. Additional treatment may include nutritional support, fluid and electrolyte therapy and supportive care to prevent bed sores and wounds in dogs that are unable to stand or walk.
Prognosis
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Provided that the underlying cause of your dog's myositis is successfully treated, his prognosis is fair. Although it is possible to eventually withdraw all medication, some dogs require life-long therapy.
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