The vestibulum vaginae of dog is covered with a thick uncornified stratified flat epithelium and strongly developed papillae are formed from the propria into the epithelium. The vestibulum passes over into the labium minus pudendi near the outer edge of the so-called labium vulvae. Hair follicles make appearance in the latter, which is, however, lined with a thick epithelium with strongly developed papillae beneath it, so that it does not belong to the usual hairy skin, but is under a transitional part between mucous membrane and skin. The labium majus is represented by a usual haired skin consisting of papillaless thin cornified epidermis and corium. Unlike as in human pudenda, no pigment granules are found in the canine counterparts, and smooth muscle fibres are very scarce in the latter, being almost entirely absent in the labia.The nerve fibres distributed in the canine vulva are found abundantly in the vestibulum vaginae and the labia minora in proportion with the good development of the papillae, as was the case in man. In the labia minora, sensory hair-nerve fibres connected with hair follicles are fonnd in existence. On the other hand, as papillae are not found in the labia majora, its stratum papillare is very poor in sensory fibres, only terminations of sensory hair-nerve fibres being found here.In the vestibulum vaginae plexus proprius is formed, from which sensory fibres run out to form their terminations in the propria, especially, in the papillae in most cases, but not rarely fibres are found that run further up into the epithelium to end as intraepithelial fibres. As terminations in the propria, beside the usual unbranched and simple branched terminations, some uncapsulated simple glomerular terminations may be mentioned. All these are composed of fibres showing marked change in size during their courses in most cases.In an unbranched termination, a simple devaginated fibre runs a peculiar winding course to end sharply, while in a simple branched termination the fibre divides into 2-5 branches which run similar courses. The glomerular terminations, which do not belong to the genital nerve bodies, are always uncapsulated and consist of very simple glomerular arrangement of sensory fibres.The intraepithelial fibres chiefly originate in thick sensory fibres and show much or less change of size during their courses, ending sharply or bluntly in the basal layer of the epithelium. They run intra- as well as intercellularly as the other intraepithelial fibres.In the canine labia minora too, plexus proprius not to be found in usual haired skin is formed in the subepithelial connective tissue layer. The sensory fibres emerging from such a plexus form their terminations chiefly in the papillae, but here none of them pass over into intraepithelial fibres. Beside the unbranched and simple branched terminations similar to those in the vestibulum above, we find here some special complex branched terminations, which are formed in the close vicinity of the tip of the epithelial erista found between adjoining papillae. In such a special termination, one or two thick sensory fibres, after losing their myelin sheath, divide into several branches, which, after running special peculiar winding courses while showing marked change in size, mostly show as the whole an arborized arrangement and end sharply.In the labia majora pudendi of dog, only sensory hair-nerve fibres are found in abundance, almost no sensory fibres being found in the stratum papillare, Sensory hair nerve fibres are found also in the labia minora of dog, and their terminal formation is entierly identical in both the larger and the smaller labia. These fibres run into the follicle necks over the lower brims, and end in the SETO's hair-nerve tubes formed in the follicle necks or in the transparent layer just inside the tubes, mostly in plexus-like terminations.