Small Dog Comfort Adapter fits most Dogtra remote collars;

SD Comfort Adapter For E-Training Collars, & Electric Fences The SD Comfort Adapter is designed with small breeds in mind, however this incredibly designed contact pad can also be used as a COMFORT ADAPTER on larger breeds or on dogs with sensitive skin. The design of the adapter allows for the replacement of the standard contact points on electronic Collars with a flat and multi-point "pad" design. This increases comfort with all dogs, ensures proper contact on dogs that have smaller necks, "smooths" out the stimulation of the collar making it ideal for sensitive dogs, and also helps reduce irritation for dogs with sensitive skin. This adapter does not fit YS500 No-Bark collars. It will fit No-Bark YS300! US Patent # 7685971