
Treatment is directed towards treating underlying cause.
This condition itself is not life-threatening and treating the underlying cause results in complete resolution of problem. However, if left untreated, LBBB can lead to more severe heart rhythm changes or even complete heart block.
You may be required to take your pet for regular follow-ups exams to evaluate the status of disease and the dog's response to treatment. No diet modifications are necessary, unless required to manage underlying condition.