In dogs, the ear is subdivided into three parts: the external ear, the middle ear and the internal ear. The external ear consists of the pinna and the external auditory canal. The particularity of this canal lies in its original shape compared to that of humans: a long bent tube (L-shaped). The canal generally contains a small quantity of cerumen (earwax, composed of dead cells and oily secretions) which serves as a protection. Sometimes the elimination mechanism of the cerumen can get blocked, leading to an inflammation of the external auditory canal. Such a case is referred to an external otitis (otitis externa). It is thus important to choose an efficient yet gentle cleanser.