The gum of dog is rather rich in sensory fibres, which are, however, poorer in development than those in the human gum. Most of their terminations are formed in the papillae, but some are also found in extrapapillar and intraepithelial positions.
The extrapapillary terminations comprise simple arborized and simple ansiformed ones, but in the papillae we find only simple ansiformed and simple ball-formed terminations on rare occasions, beside tho simple branched and unbranched terminations, but never such rather complex glomerular terminations as found in the human gum.
The intraepithelial terminations also can be classified into the unbranched and the simple branched types. These terminations consist of thin, smooth-surfaced fibres, which either run toward the superficial layer or only within the basal layer of the epithelium, to end in sharp points.