This can cause regurgitation and lead to inhalation pneumonia. Myasthenia gravis can be very variable in the way it looks. Only a few muscle groups may be affected or the dog may be nearly immobile. A dog can be almost normal after a rest and then lose strength very rapidly when it exercises at all. Conversely, whenever myasthenia gravis is diagnosed, chest X-rays should be done to evaluate the esophagus, in case megaesophagus is present.
Dogs usually show an immediate improvement in muscle strength that is of short duration.
Specific lab tests for this disease are available to confirm the diagnosis. Dogs that acquire MG later in life usually have a fairly good prognosis with treatment. It is important to prevent aspiration pneumonia, so dogs should be fed from elevated food bowls and encouraged to remain standing for 10 minutes or so after eating. Anticholinesteras medications are very helpful. In severe cases, corticosteroids may be necessary.