A comfort adapter for electronic collars that replaces the standard post electrodes normally found on electronic training collars with a plurality of acorn nut electrodes. This design ensures proper electrical contact with the dog's skin while increasing the comfort of these collars on small dogs, which have smaller necks. The adapter can be utilized with different types of electronic training collars, such as those used to facilitate training, to curb aggressive behavior and barking, and to confine dogs by means of an invisible fence.